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Spores on leaf Black & White Stock Photos
RMRDDA65–. Lessons in botany. Botany. Fig Under side dium spinulosum showing dots (sori). of pinna of Aspi- fruit. Fig- '35- Four pinnjE of adiantum, showing recurved margins which cover the sporangia. fern, or of any one of many of the species of the true ferns just at the ripening of the spores, and place a portion of a leaf on a piece of white paper in a dry room, in a very short time we shall see that the paper is being dusted with minute brown objects which fly out from the leaf. Now if we take a portion of the same. Please note that these images are extracted from scanned page images that may hav
RMRDDA0A–. Lessons in botany. Botany. 204. BOTANY. organs. Now the fern leaf bears the spores and the spore forms the prothallium. So it is in the flowering plants. The stairen bears the small spores—pollen grains—and the pollen grain. Fig- 182. Diagrammatic section of a flower. Ke, calyx; K, corolla ; A the filament, and <z, the anther, of the stamen ; p, pollen-cells, some in the anther, others on the stigma ; F, the ovary, surmounted by the style, g, and the stigma, n (this ovary contains one ovule, which has a single coat, i, enclosing the ovule-body, S) ; em, the embryo-sac; E, germ-cell; /j, a
![. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 623 tapering, obtuse, basally dark-brown, slightly constricted at the septa, 5 to 9 times cross-septate and 0-5 times longitudinally septate. It causes injury on carnation leaves and stems. A. solani (E. & M.) Jones & Grout. '"• ^''''"'-'" Spots brown, circular to elliptic, concentrically zonate, amphige- nous, irregularly scattered over the leaf surface; mycelium. Fio. 422.—A. solani, 2, spores germinating and penetrating the living potato leaf; 5, showing cateuulatiou of Stock Photo](https://c8.alamy.com/comp/RDE4XM/the-fungi-which-cause-plant-disease-plant-diseases-fungi-the-fungi-which-cause-plant-disease-623-tapering-obtuse-basally-dark-brown-slightly-constricted-at-the-septa-5-to-9-times-cross-septate-and-0-5-times-longitudinally-septate-it-causes-injury-on-carnation-leaves-and-stems-a-solani-e-amp-m-jones-amp-grout-quot-quot-quot-spots-brown-circular-to-elliptic-concentrically-zonate-amphige-nous-irregularly-scattered-over-the-leaf-surface-mycelium-fio-422a-solani-2-spores-germinating-and-penetrating-the-living-potato-leaf-5-showing-cateuulatiou-of-RDE4XM.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 623 tapering, obtuse, basally dark-brown, slightly constricted at the septa, 5 to 9 times cross-septate and 0-5 times longitudinally septate. It causes injury on carnation leaves and stems. A. solani (E. & M.) Jones & Grout. '"• ^''''"'-'" Spots brown, circular to elliptic, concentrically zonate, amphige- nous, irregularly scattered over the leaf surface; mycelium. Fio. 422.—A. solani, 2, spores germinating and penetrating the living potato leaf; 5, showing cateuulatiou of Stock Photo")
RMRDE4XM–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 623 tapering, obtuse, basally dark-brown, slightly constricted at the septa, 5 to 9 times cross-septate and 0-5 times longitudinally septate. It causes injury on carnation leaves and stems. A. solani (E. & M.) Jones & Grout. '"• ^''''"'-'" Spots brown, circular to elliptic, concentrically zonate, amphige- nous, irregularly scattered over the leaf surface; mycelium. Fio. 422.—A. solani, 2, spores germinating and penetrating the living potato leaf; 5, showing cateuulatiou of
RMRDKY58–. The Cambridge natural history. Zoology. 92 PROTOZOA determine the rupture of the fruit-wall and the scattering of the spores. Again, in some cases the plasmodia themselves aggregate in the same way as the amoeboids do in the Acrasieae, and combine /• spff.2. cvac Fig. 30. —Didyniium dlffovme. A, two sporangia [spy 1 aad 2) on a fragment of leaf (^) ; B, section of sporangium, with ruptured outer layer (a), and threads of capillitium (cp); C, a flagellnla with contractile vacuole {cvac) aud nucleus (nu) ; D, tlie same after loss of flagellnni; b, an ingested bacillus ; E, an amoebula ; F, con
RMRDJ2R3–. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. 63. The Ferns have leaf- like fronds -which bear the spores, though the spore-bear- ing fronds are often trans- 7 formed, as in the Osmunda (Fig. 33). The fronds are forJe-vdned (Fig. 33, a) and cirdnate in bud,—rolled like isier (Fig. 34). The spore- cases are in groups called Sori (L. so7'us, a heap), on the under surface of the frond; either at the end of the veins and near the margin (Fig. 34) or variously arranged along the veins (Figs. 33,35). The fronds vary Fio. Ka
RMRDHNWP–. Elements of plant biology. Plant physiology. LIFE HISTORY OF RUST FUNGI 179. on the surface, and the aggregation of protoplasm in the branched apex. X 475. C, single teleutospore. X 200. D, germination of teleutospore of another rust fungus and formation of sporidia. X 475. E, aecidium cup of another form in vertical section (crossrsection of leaf) ; myc, mycelium of the fungus; is, aecidio- spores; It., leaf tissue; ep., epidermis of leaf. (After De Bary.) X 150. F, germination of secidiospore on a grass leaf, penetration of a stoma by and branching of the germ tube. X 475. (All except E af
![. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 311 as in a moist" chamber, the length mentioned may be considerably exceeded. After the death of a leaf, spores may be produced over the entire surface. Spores found upon old leaves in the field five months after the beets were harvested were able to germinate. The fresh spores germinate readily in ordinary nutrient media, and pure cultures may be obtained by the poured plate method. After a growth of a few days the colonies show up well. The sub- merged myce Stock Photo](https://c8.alamy.com/comp/RDJ6DP/fungous-diseases-of-plants-with-chapters-on-physiology-culture-methods-and-technique-fungi-in-agriculture-fungi-imperfecti-311-as-in-a-moistquot-chamber-the-length-mentioned-may-be-considerably-exceeded-after-the-death-of-a-leaf-spores-may-be-produced-over-the-entire-surface-spores-found-upon-old-leaves-in-the-field-five-months-after-the-beets-were-harvested-were-able-to-germinate-the-fresh-spores-germinate-readily-in-ordinary-nutrient-media-and-pure-cultures-may-be-obtained-by-the-poured-plate-method-after-a-growth-of-a-few-days-the-colonies-show-up-well-the-sub-merged-myce-RDJ6DP.jpg ". Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 311 as in a moist" chamber, the length mentioned may be considerably exceeded. After the death of a leaf, spores may be produced over the entire surface. Spores found upon old leaves in the field five months after the beets were harvested were able to germinate. The fresh spores germinate readily in ordinary nutrient media, and pure cultures may be obtained by the poured plate method. After a growth of a few days the colonies show up well. The sub- merged myce Stock Photo")
RMRDJ6DP–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 311 as in a moist" chamber, the length mentioned may be considerably exceeded. After the death of a leaf, spores may be produced over the entire surface. Spores found upon old leaves in the field five months after the beets were harvested were able to germinate. The fresh spores germinate readily in ordinary nutrient media, and pure cultures may be obtained by the poured plate method. After a growth of a few days the colonies show up well. The sub- merged myce
RMRE38A4–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 27. P. Poai-um. An seoidio- spore germinating on leaf of Poa annua, x 180.. Fig. 26. P. Poaruin. Vertical section through edge of secidium; showing a, the crushed cells of the upper myce- lium, pushed on one side ; 6, the chain of peridium-cells; c, the spore bed, giviBg rise to d, the chains of Eecidio- spores. X 600. The black dots are the nucleoli; one ascidiospore-mother- cell has three nuclei. case in most of the higher forms of the Uredinales, arises deep in the leaf, and the densely packed knot of h
![. Lessons in botany. Botany. FUNGI: WHEAT RUST. 133 For a fuller study of the wheat rust and of other fungi see the author's larger " Elementary Botany," Chapters XX, XXI.. Wheat rust. Fig. 113- Section through leaf of barberry at point affected with the cluster-cup stage of the wheat rust; spermagonia above, aecidia below. (After Marshall-Ward.) Synopsis. A parasite on grains, grasses, and on the barberry. Vegetative part of plant; mycelium growing within the tissues of the host. Fruiting part of the plant. 1st. Red rust (one-celled spores in pustules on blades and stems of the whea Stock Photo](https://c8.alamy.com/comp/RDDA8K/lessons-in-botany-botany-fungi-wheat-rust-133-for-a-fuller-study-of-the-wheat-rust-and-of-other-fungi-see-the-authors-larger-quot-elementary-botanyquot-chapters-xx-xxi-wheat-rust-fig-113-section-through-leaf-of-barberry-at-point-affected-with-the-cluster-cup-stage-of-the-wheat-rust-spermagonia-above-aecidia-below-after-marshall-ward-synopsis-a-parasite-on-grains-grasses-and-on-the-barberry-vegetative-part-of-plant-mycelium-growing-within-the-tissues-of-the-host-fruiting-part-of-the-plant-1st-red-rust-one-celled-spores-in-pustules-on-blades-and-stems-of-the-whea-RDDA8K.jpg ". Lessons in botany. Botany. FUNGI: WHEAT RUST. 133 For a fuller study of the wheat rust and of other fungi see the author's larger " Elementary Botany," Chapters XX, XXI.. Wheat rust. Fig. 113- Section through leaf of barberry at point affected with the cluster-cup stage of the wheat rust; spermagonia above, aecidia below. (After Marshall-Ward.) Synopsis. A parasite on grains, grasses, and on the barberry. Vegetative part of plant; mycelium growing within the tissues of the host. Fruiting part of the plant. 1st. Red rust (one-celled spores in pustules on blades and stems of the whea Stock Photo")
RMRDDA8K–. Lessons in botany. Botany. FUNGI: WHEAT RUST. 133 For a fuller study of the wheat rust and of other fungi see the author's larger " Elementary Botany," Chapters XX, XXI.. Wheat rust. Fig. 113- Section through leaf of barberry at point affected with the cluster-cup stage of the wheat rust; spermagonia above, aecidia below. (After Marshall-Ward.) Synopsis. A parasite on grains, grasses, and on the barberry. Vegetative part of plant; mycelium growing within the tissues of the host. Fruiting part of the plant. 1st. Red rust (one-celled spores in pustules on blades and stems of the whea
RMRE2GA9–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. CEONARTIUM 317 Teleutospores. Columns hypophyllous, cylindrical, curved, up to 2 mm. long, crowded especially along the veins of the leaf, sometimes covering the whole leaf, orange to brownish- yellow ; spores oblong, smooth, reaching 70 fi long x 21 /x broad. jEcidia on stems and branches of Pinus GeHibra, P. monti- cola, P- Strobus, March—June; uredo- and teleutospores on Kibes nigrum, R. rubrurn, etc.,'July—October. Uncommon except when imported; Surrey, King's Lynn, Exeter, West- bury, Wobum, Windsor Forest
RMRE2G6B–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 252. E. Sem- pervivi. Sori on Seinpervivum mon- tanum (reduced). Speriiwgones. Scattered amongst the seciSia, roundish. Teleutospores. Sori rather large, amphi- genous, sunken in the leaf, secidium-like, sur- rounded by many layers of hyphse and by a peridium, which opens by a pore at the summit and finally becomes cup-shaped; spores bluntly polygonal or roundish, yellowish-brown, densely reticulate-ver rucose, 24—35 x 21—28/x; epispore 3—4i/jl thick. On Sempervivum tectorum; also found on *S. calcareum, S
RMRE2G4C–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 348 MELAMPSOEA Teleutospores. Sori hypophyllous, subepidermal, scattered over the leaf singly and in groups, pulvinate, —f mm., blackish-brown, not shining; spores prismatic, rounded at both ends, 35—60 x 6—10 /i; epispore clear-brown, 1—1^ fi thick, scarcely thickened above, without evident germ-pore. Cseomata on Allium Cepa, A. ursinum and other species. May; uredo- and teleutospores on Populus nigra, P. balsami- fera. (Fig. 260.) The description is chiefly after Klebahn. The teleutospores mature in February
RMRDJ2RC–. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. 36 ACADEMIC BOTANY.. 63. The Ferns have leaf- like fronds -which bear the spores, though the spore-bear- ing fronds are often trans- 7 formed, as in the Osmunda (Fig. 33). The fronds are forJe-vdned (Fig. 33, a) and cirdnate in bud,—rolled like isier (Fig. 34). The spore- cases are in groups called Sori (L. so7'us, a heap), on the under surface of the frond; either at the end of the veins and near the margin (Fig. 34) or variously arranged along the veins (Figs. 33,35). Th
RMRDJD60–. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. Figure 87. Pnllavicinia Lyellii (After Sullivant.) Plant; part of thallus with involucre, perianth and ca- lyptra; part of perianth cut away to show young calyp- tra; capsule closed and open; antheridium enclosed in a leaf; elater and spores. in swampy places and on PALLAVICINIA. p. Lyellii S. F. Gray {Steetsia of authors) has a flat creeping thallus, J4 to nearly ^ inch wide, sometimes reaching four inches in length, with margin somewhat sinuate,
RMRDW9FY–. Botany for high schools and colleges. Botany. 372 BOTANY.. Pig. 866.—Prothalllum and young plant of Adi- antum CapUlus-Veneris, seen in vertical longitudinal section. ^,^, the prothallium ; a, archegonia : h, root- hair ; E, the young plant; w, its first root; 6, its first leaf. X about 10.—After Sachs. 490.—The Pilicinse may be here arranged iiiider four orders, as follows :* /. IsosporecB.— Spores of one kind. Order 1. rilioes, the true Ferns. Sporangia compos- ed of modified tri- cViomes, each de- veloped from a sin- gle epidermal cell, prodnced in clusters on the surface of or- dinary or
RMRDCYCC–. Botany for agricultural students . Botany. Fig. 322. —Pus- tules on the bark of n Chestnut caused by the Chestnut Blight Fungus. From Bulletin 380, U. S. Dept. Agri- culture, 1917. Fig. 323. — Powdery Mildew on an Apple leaf. The light areas arc due to the presence of many superficial hyphae. From BuUelin ISO, Maine Agr. Exp. Sta. produced {Fig. 322). The summer spores are extruded in threads and spread the disease to other trees. In autumn these same pustules develop deeply buried perithecia in which the ascospores (winter spores) develop. The ascospores germinate the next spring and when c
RMRDY60H–. Botany of the living plant. Botany. 446 BOTANY OF THE LIVING PLANT that the germ-tubes emerge when grown in water (Fig. ^7^)- H this germination takes place on a wet leaf of wheat, the tube growing over the surface finds entry by a stoma (Fig. 379), and at once gains access to the nutritive cells. In about a fortnight the infected spot will be producing fresh uredo-spores. The Teleuto-spores arise from the same spore-bed later in the season. They differ in being closely packed and firmly attached, as well as in structure. Each spore is spindle-shaped, and is partitioned. Please note that the
![. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 397 EricacejE. Cultural work and studies in infection are needed be- fore species can be properly delimited.'' E. vaccinii (Fcl.) Wor. occurs on Vaccinium vitis idaea, forming large blisters on the leaves, rarely on petioles and stems, discoloration red or purple. The fungus appears as a white bloom on the under surface of the leaf; spores narrowly fusiform, 5-8 x 1-2 n. Richards ^ who studied E. vaccinii and E. an- dromedse from inoculations concludes: "Aside from the form of the distortion Stock Photo](https://c8.alamy.com/comp/RDE5XJ/the-fungi-which-cause-plant-disease-plant-diseases-fungi-the-fungi-which-cause-plant-disease-397-ericaceje-cultural-work-and-studies-in-infection-are-needed-be-fore-species-can-be-properly-delimited-e-vaccinii-fcl-wor-occurs-on-vaccinium-vitis-idaea-forming-large-blisters-on-the-leaves-rarely-on-petioles-and-stems-discoloration-red-or-purple-the-fungus-appears-as-a-white-bloom-on-the-under-surface-of-the-leaf-spores-narrowly-fusiform-5-8-x-1-2-n-richards-who-studied-e-vaccinii-and-e-an-dromedse-from-inoculations-concludes-quotaside-from-the-form-of-the-distortion-RDE5XJ.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 397 EricacejE. Cultural work and studies in infection are needed be- fore species can be properly delimited.'' E. vaccinii (Fcl.) Wor. occurs on Vaccinium vitis idaea, forming large blisters on the leaves, rarely on petioles and stems, discoloration red or purple. The fungus appears as a white bloom on the under surface of the leaf; spores narrowly fusiform, 5-8 x 1-2 n. Richards ^ who studied E. vaccinii and E. an- dromedse from inoculations concludes: "Aside from the form of the distortion Stock Photo")
RMRDE5XJ–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 397 EricacejE. Cultural work and studies in infection are needed be- fore species can be properly delimited.'' E. vaccinii (Fcl.) Wor. occurs on Vaccinium vitis idaea, forming large blisters on the leaves, rarely on petioles and stems, discoloration red or purple. The fungus appears as a white bloom on the under surface of the leaf; spores narrowly fusiform, 5-8 x 1-2 n. Richards ^ who studied E. vaccinii and E. an- dromedse from inoculations concludes: "Aside from the form of the distortion
RMRDH2R1–. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. Figure 100. Scapania nemorosa. Branch X 2. Leaf X 10. tinctly longer than broad and are strongly ciliate-dentate. The leaves are stiff and only a little larger above. The perianth mouth is ciliate-dentate. The spores mature in spring. S. UNDULATA (L.) Dum., the Aquatic Scapania, is less common than the pre- ceding and grows on stones in streams or in very wet places. It is green, or frequently red or dark brownish-red. The leaves are flaccid and d
RMRE37RW–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 158 PUCCINIA. Pig. 109. P. major. Te leutospore, on G. palu Uredospores. Sori amphigenous, solitary, minute, cinnamon; spores subglobose to ovoid, distinctly echinulate, brownish, 24—30 x 21— 26/x. Teleutospores. Sori chiefly hypo- phyllous, similar, but blackish-brown, standing singly, scattered over nearly the whole leaf-surface; spores ellipsoid to ovoid, rounded at both ends, not thickened above, hardly constricted, very delicately verruculose, chestnut- (Zosa; a, seeidia on leaf of r, oo ao v, oo oa . '' s
RMRDE1FN–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. DETAILED ACCOUNT OF SPECIFIC DISEASES OF PLANTS 5II. Fig. 183.—Details of cranberry scald fungus {Guignardia vaccinit). i, A cran- berry leaf, showing pycnidia of Guignardia vaccinii thickly scattered over the under surface; a, a cranberry blossom blasted by Guignardia vaccinii, showing pycnidia on calyx, corolla, and pedicel; 6, a blasted fruit, showing pycnidia. a, A vertical section of a single pycnidium of Guignardia vaccinii from a cranberry leaf, showing pycno- spores in various s
RMRE2G4N–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 344 MELAMPSOEA Spermogones. stomata. ^cidiospores. Hardly projecting, flat, mostly under the. Fig. 259. M. Orrlndi- repentis. Ca?oma on leaf of Listera ovata, from one ol Plowright's cul- tures (reduced). Cseomata irregular in outline, clustered or circinate on large pale-yellowish spots, often confluent, 1—2 mm. diam.; bright orange- yellow; spores roundish-polygonal, 11—20 x 11—15/a; epispore very thin, delicately warted. Uredospores. Sori hypophyllous, minute, deep-orange, causing yellow spots on the upper s
![. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 351.—Actinonema rosae. 3, branching strand of superficial mycelium; 4, spores. After Southworth. A. manihotes Hen. on cassava in Africa. A. tremulae Sacc. occurs on aspen; A. melutispora B. & Br. on ash. Actinonema Fries (p. 505) Pyenidia very small, not ostiolate, with a radiating mycelial growth on the surface of the host; conidia elongate, on short conidiophores. A genus of about fifteen species, chiefly leaf parasites. A. rosse (Lib.) Fr.^'*- "« Spots rounded or irregular, black or purple, epiphyllous, often. Plea Stock Photo](https://c8.alamy.com/comp/RDE5AP/the-fungi-which-cause-plant-disease-plant-diseases-fungi-fig-351actinonema-rosae-3-branching-strand-of-superficial-mycelium-4-spores-after-southworth-a-manihotes-hen-on-cassava-in-africa-a-tremulae-sacc-occurs-on-aspen-a-melutispora-b-amp-br-on-ash-actinonema-fries-p-505-pyenidia-very-small-not-ostiolate-with-a-radiating-mycelial-growth-on-the-surface-of-the-host-conidia-elongate-on-short-conidiophores-a-genus-of-about-fifteen-species-chiefly-leaf-parasites-a-rosse-lib-fr-quot-spots-rounded-or-irregular-black-or-purple-epiphyllous-often-plea-RDE5AP.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. Fig. 351.—Actinonema rosae. 3, branching strand of superficial mycelium; 4, spores. After Southworth. A. manihotes Hen. on cassava in Africa. A. tremulae Sacc. occurs on aspen; A. melutispora B. & Br. on ash. Actinonema Fries (p. 505) Pyenidia very small, not ostiolate, with a radiating mycelial growth on the surface of the host; conidia elongate, on short conidiophores. A genus of about fifteen species, chiefly leaf parasites. A. rosse (Lib.) Fr.^'*- "« Spots rounded or irregular, black or purple, epiphyllous, often. Plea Stock Photo")
RMRDE5AP–. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 351.—Actinonema rosae. 3, branching strand of superficial mycelium; 4, spores. After Southworth. A. manihotes Hen. on cassava in Africa. A. tremulae Sacc. occurs on aspen; A. melutispora B. & Br. on ash. Actinonema Fries (p. 505) Pyenidia very small, not ostiolate, with a radiating mycelial growth on the surface of the host; conidia elongate, on short conidiophores. A genus of about fifteen species, chiefly leaf parasites. A. rosse (Lib.) Fr.^'*- "« Spots rounded or irregular, black or purple, epiphyllous, often. Plea
RMRPY18H–. Hawaiian Fungi. Fungi. Stevens—Hawaiian Fungi 103 No. 151. Mycospliaerella freycinetiae Stevens n. sp. Spots irregularly elliptical, visible from both sides of the leaf, tan colored, dead. Margins definite. Centers thickly studded with perithecia which are black, ostiolate, 150-200 fi in diameter. Asci numerous, 8-spored, 65-80 by 18 At, thickened strongly at apex. No paraphyses. Spores inordinate, hyaline, i-septate, 18-21 by 3:3 P, cylin- drical, straight, obtuse, not constricted. (See fig. 27, a.) On Freycinetia arnotti. Oahu: Kalihi valley, Dec. 1908, Forbes no. 3. No. 152. Mycosphaerell
RMRDE352–. Minnesota plant diseases. Plant diseases. 354 Minnesota Plant Diseases.. Fig. 187.—Spores of the apple scab fungus. A. Portion of a section through a scab spot on an apple; b, fungus threads spreading under and lifting the cuticle; a and c, partly disorganized cells of the apple; e, healthy cells of the apple. B. Two spore-bearing stalks giving rise to summer Spores. C. Spores germinating. D. Portion of a section through an affected leaf of an apple which has lain on the ground over winter and has given rise to the winter spore stage of the disease; g, spore-case containing a bundle of spore
RMRDDBPP–. The fungi which cause plant disease . Plant diseases; Fungi. 188 THE FUNGI WHICH CAUSE PLANT DISEASE or more or less persistent; perithecia usually scattered, rarely gregarious, 140-270 /t, rarely up to 350 n; cells rather obscure, 15-20 fi; the apical outgrowth becomes mucilaginous attaching the perithecium firmly to places where it may fall; appendages. Fig. 137.—Phyllactinia corylea. 1. Natural size, on chestnut leaf. 2. Perithecium enlarged. 3. Two asci. 4. Three spores. 5. Conidia-bearing hyphae. 6. Co- nidium germinating. After Anderson. 5-18, equatorial, 1 to 3-times the diameter of t
RMRDTWAE–. Textbook of botany. Botany. 62 TEXTBOOK OF BOTANY finally breaks the epidermis of the leaf. Each cell of the basal layer, like each of the other cells of the fungus up to this time, contains a single nucleus. These basal cells become joined in twos by a dis- solving of part of the walls between each pair of adjoining cells (Fig. 27, D, a) ; the two cells of each pair have now become a single cell of ir-. FiG. 27. — A, a section through a portion of an infected barberry leaf bearing spring spores on the lower surface and spermatia on the upper sur- face. B, a section through a cluster cup, sh
RMRDXJN0–. The vines of northeastern America;. Climbing plants. xxii Guide. nearly parallel (Endogens). No. 25 (Li'liaceae) 173, Smilax in Lily Fam. Series B.—Vines producing in place of real flowers and seeds, yellow dust-like spores in minute spore-cases (Cryptdgamous plants). (a) Spore-cases borne on the back of the leaf. Climbing Fern in Fern Fam. No. 26 (Filices), page 186. (a) Spore-cases in spikes solitary at the base of the small, ever- green leaves, low moss-like plants. Lycopodium in Club-Moss Fam. No. 27 (Lycopodiacese), page 186.. Please note that these images are extracted from scanned pag
![. Fossil plants : for students of botany and geology . Paleobotany. xxiv] NOEGGERATHIA 429 axis bearing ovate leaves with numerous spreading veins. The upper part of the axis forms a spike composed of fertile leaves in the form of transversely oval bracts 2 cm. broad with a serrate B ^^f^/^ff. Fio. 302. Noeggerathia foliosa. (After Stur; A, reduced.) B, Fertile leaf; C, Sporangium. edge bearing on the upper face several sporangia (3x4 mm.) in some of which spores have been seen (fig. 302, B, C). In another form described by Weiss' the bracts bear a greater 1 Weiss, C. E. (79).. Please note th Stock Photo](https://c8.alamy.com/comp/RDF4EW/fossil-plants-for-students-of-botany-and-geology-paleobotany-xxiv-noeggerathia-429-axis-bearing-ovate-leaves-with-numerous-spreading-veins-the-upper-part-of-the-axis-forms-a-spike-composed-of-fertile-leaves-in-the-form-of-transversely-oval-bracts-2-cm-broad-with-a-serrate-b-fff-fio-302-noeggerathia-foliosa-after-stur-a-reduced-b-fertile-leaf-c-sporangium-edge-bearing-on-the-upper-face-several-sporangia-3x4-mm-in-some-of-which-spores-have-been-seen-fig-302-b-c-in-another-form-described-by-weiss-the-bracts-bear-a-greater-1-weiss-c-e-79-please-note-th-RDF4EW.jpg ". Fossil plants : for students of botany and geology . Paleobotany. xxiv] NOEGGERATHIA 429 axis bearing ovate leaves with numerous spreading veins. The upper part of the axis forms a spike composed of fertile leaves in the form of transversely oval bracts 2 cm. broad with a serrate B ^^f^/^ff. Fio. 302. Noeggerathia foliosa. (After Stur; A, reduced.) B, Fertile leaf; C, Sporangium. edge bearing on the upper face several sporangia (3x4 mm.) in some of which spores have been seen (fig. 302, B, C). In another form described by Weiss' the bracts bear a greater 1 Weiss, C. E. (79).. Please note th Stock Photo")
RMRDF4EW–. Fossil plants : for students of botany and geology . Paleobotany. xxiv] NOEGGERATHIA 429 axis bearing ovate leaves with numerous spreading veins. The upper part of the axis forms a spike composed of fertile leaves in the form of transversely oval bracts 2 cm. broad with a serrate B ^^f^/^ff. Fio. 302. Noeggerathia foliosa. (After Stur; A, reduced.) B, Fertile leaf; C, Sporangium. edge bearing on the upper face several sporangia (3x4 mm.) in some of which spores have been seen (fig. 302, B, C). In another form described by Weiss' the bracts bear a greater 1 Weiss, C. E. (79).. Please note th
![. The fungi which cause plant disease . Plant diseases; Fungi. 556 THE FUNGI WHICH CAUSE PLANT DISEASE CI^N ' 100-120 /I, or by confluence larger; I /vO conidia abundant, clavate or wedge- ^ shaped, 11-15 x 2.5-3 n. The cause of leaf perforations of lettuce. M. violae (Pass.) Sacc."' Discoloration of the host slight; ^ ^^-^ 2^:^^yy acervuli nvunerous, scattered, small; ,,^ (f""" â conidia curved, or straight, 15-18 x yK^;;;-y^ J 5-6 ii, septum usually excentric. T, â,, ., , Small spots are produced on violet Fig. 374.âMarssonia violse. Spores and conidiophores. leaveS. Stock Photo](https://c8.alamy.com/comp/RDE560/the-fungi-which-cause-plant-disease-plant-diseases-fungi-556-the-fungi-which-cause-plant-disease-cin-100-120-i-or-by-confluence-larger-i-vo-conidia-abundant-clavate-or-wedge-shaped-11-15-x-25-3-n-the-cause-of-leaf-perforations-of-lettuce-m-violae-pass-saccquot-discoloration-of-the-host-slight-2yy-acervuli-nvunerous-scattered-small-fquotquotquot-conidia-curved-or-straight-15-18-x-yk-y-j-5-6-ii-septum-usually-excentric-t-small-spots-are-produced-on-violet-fig-374marssonia-violse-spores-and-conidiophores-leaves-RDE560.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. 556 THE FUNGI WHICH CAUSE PLANT DISEASE CI^N ' 100-120 /I, or by confluence larger; I /vO conidia abundant, clavate or wedge- ^ shaped, 11-15 x 2.5-3 n. The cause of leaf perforations of lettuce. M. violae (Pass.) Sacc."' Discoloration of the host slight; ^ ^^-^ 2^:^^yy acervuli nvunerous, scattered, small; ,,^ (f""" â conidia curved, or straight, 15-18 x yK^;;;-y^ J 5-6 ii, septum usually excentric. T, â,, ., , Small spots are produced on violet Fig. 374.âMarssonia violse. Spores and conidiophores. leaveS. Stock Photo")
RMRDE560–. The fungi which cause plant disease . Plant diseases; Fungi. 556 THE FUNGI WHICH CAUSE PLANT DISEASE CI^N ' 100-120 /I, or by confluence larger; I /vO conidia abundant, clavate or wedge- ^ shaped, 11-15 x 2.5-3 n. The cause of leaf perforations of lettuce. M. violae (Pass.) Sacc."' Discoloration of the host slight; ^ ^^-^ 2^:^^yy acervuli nvunerous, scattered, small; ,,^ (f""" â conidia curved, or straight, 15-18 x yK^;;;-y^ J 5-6 ii, septum usually excentric. T, â,, ., , Small spots are produced on violet Fig. 374.âMarssonia violse. Spores and conidiophores. leaveS.
RMRDYBRY–. The essentials of botany. Botany. 192 BOTANY. of the leaves of the Barberry. These cups are at first rounded masses of conidia which develop on the internal. FiQ. 113.—Wheat-rust (Puooinia graminia). J, a cross-seotion of a Bar- berry-leaf through a mass of cluster-cups; o, n, a, cups opened and shed- ding their conidia; p, and A, above, cups not yet opened ; sp, sj), spermo- gones which produce spermatia, whose function is not known. J/, three Red-rust spores, ur, on stalks; f, a Black-rust spore. III., a mass of Black- rust spores bursting through the epidermis 6, of a leaf. All highly mag
RMRPY163–. Hawaiian Fungi. Fungi. Figure;30.—Pycnidia of Leptothyrium sidae (No. 912) on Sida spinosa: a, view from above; b, section showing spores. No. 307. Leptothyrium pothi Amy G. Weedon n. sp. Spots definite, irregular in shape, 0.5 by 1 cm. to 8 by 3 cm., or by coalescing occupying almost half of the leaf area, limited by the mid-rib, visible from both sides of the leaf, ashy to white. Pycnidia more abundant near the edge of the spot, gregarious, in areas about 2 by 5 mm. to 8 mm. in diameter, arranged in a somewhat concentric manner; hypophyllous, black, subepidermal, 133-180 by 136-198^. Ostio
RMRE382K–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON LILIACE.E 119 interrupted and anastomosing, brown, 28—44 x 22—30 ^; epi- spore 2—3} yu, thick ; pedicels hyaline, slender, deciduous.. Fig. 70. U. Lilii. a, leaf of Liliuin candiduvi, with recidia ; b, another, witli teleuto-sori, nat. size; c, cells of peridium, iu section and inner face-view; d, teleutospores ; e, teleutospore seen from above ; /, ^cidiospore, all x 600. On Liliuin candidum. Kew Gardens; also at Birmingham, 1911-3 (C.W.Lowe). /Ecidia in Aprd, May; mature teleuto- spores from June. (Fig. 70
![. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 34. Figure 9. Leaf-apex of F. osmundi- oides. (From Bry. Eur.) MOSSES WITH A HAND-LENS less than }i inch in height; sporophyte lateral; capsule inclined, often cern- uous; beak of operculum long, usu- ally bent at base; spores maturing in late autumn or winter. On damp clayey soil. Its ''ear-mark" is the excurrent casta. F. JuuANUS (Savi.) Schimp. grows on stones in brooks and looks like a small Fontinalis. The lens readily shows the leaf str Stock Photo](https://c8.alamy.com/comp/RDJ2AH/mosses-with-a-hand-lens-a-non-technical-handbook-of-the-more-common-and-more-easily-recognized-mosses-of-the-north-eastern-united-states-mosses-34-figure-9-leaf-apex-of-f-osmundi-oides-from-bry-eur-mosses-with-a-hand-lens-less-than-i-inch-in-height-sporophyte-lateral-capsule-inclined-often-cern-uous-beak-of-operculum-long-usu-ally-bent-at-base-spores-maturing-in-late-autumn-or-winter-on-damp-clayey-soil-its-ear-markquot-is-the-excurrent-casta-f-juuanus-savi-schimp-grows-on-stones-in-brooks-and-looks-like-a-small-fontinalis-the-lens-readily-shows-the-leaf-str-RDJ2AH.jpg ". Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 34. Figure 9. Leaf-apex of F. osmundi- oides. (From Bry. Eur.) MOSSES WITH A HAND-LENS less than }i inch in height; sporophyte lateral; capsule inclined, often cern- uous; beak of operculum long, usu- ally bent at base; spores maturing in late autumn or winter. On damp clayey soil. Its ''ear-mark" is the excurrent casta. F. JuuANUS (Savi.) Schimp. grows on stones in brooks and looks like a small Fontinalis. The lens readily shows the leaf str Stock Photo")
RMRDJ2AH–. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 34. Figure 9. Leaf-apex of F. osmundi- oides. (From Bry. Eur.) MOSSES WITH A HAND-LENS less than }i inch in height; sporophyte lateral; capsule inclined, often cern- uous; beak of operculum long, usu- ally bent at base; spores maturing in late autumn or winter. On damp clayey soil. Its ''ear-mark" is the excurrent casta. F. JuuANUS (Savi.) Schimp. grows on stones in brooks and looks like a small Fontinalis. The lens readily shows the leaf str
RMRDWBP6–. The essentials of botany. Botany. 170 BOTANY. parasite, and at length burst through the epidermis (Fig. 94, A and I). The conidia quickly drop out and are car-. FiG. 94.—Wheat-rust (Puccinia graminis). f, a cross-section of a Barberry- leaf through a mass of Cluster-cups; a, o, a, cups opened and shedding their conidia; p, and A, above, cups not yet opened; so, ap, spermogones which pro- duce spermatia, whose function is not known. U, three Red-rust spores, ur, on stalks; f, a Black-rust spore. ///, a mass of Bla<!k-rust spores bursting through the epidermis, e, of a leaf. All highly magn
RMRPY192–. Hawaiian Fungi. Fungi. 102 Bernice P. Bishop Museum—Bulletin No. 149. Mycosphaerella dianellae Stevens and Weedon n. sp. Spots elliptical, 1-2 cm. long, centers ashen-white, bordered by a reddish-brown band about 1 mm. wide; border definite. Spot characters visible from both sides of the leaf. Perithecia, numerous, erumpent, epiphyllous, circular or oblong, black, ostiolate, 140 by 155 to 230 by 310 m, Asci about 50 by 11^, thick walled in the upper portion. Spores' hyaline, i-septate, oblong, obtuse, 12-14 by 3/^. (See PI. x, B; fig. 26, c, d, e.) On Diamella odorata. Oahu: Wahiawa, June 3,
RMRE2G5T–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 254. M. Larici-Caprearum. Para- physis and uredospores (one showing the thin places in the epispore); b, teleutospores. On S. Caprea. Fig. 255. M. Larici-Caprearum. Teleuto-sori, on upper face of leaf of S. Caprea, nat. size; teleuto- spore, germinating, x 360. Uredospores. Sori hypophyllous, showing as yellow spots on the upper side, variable in size and arrangement, 1—3 mm. wide; spores roundish, oval, or polygonal, 14—21 x 13—15 fj,; epispore 2—2^/a thick, firm, distantly echinulate, with thin places (?
RMRDJGWJ–. The essentials of botany. Botany. 170 BOTANY. parasite, and at length burst through the epidermis (Fig. 94, A and I). The oonidia quickly drop out and are car-. FiG. 94.—Wheat-nist (Puccinia graminis). I, a cross-section of a Barberry- leaf through a mass of Cluster-cups; a, a, a, cups opened and slieddingr their conidia; p, and A, above, cu^s not yet opened; sp, sp, spermogones which pro- duce spermatia, whose function is not Icnown. ii, three Red-rust spores, ttr, on stalks: t, a Black-rust spore. 7/J, a mass of Black-rust spores bursting through the epidermis, e, of a leaf. All highly mag
![. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases-. FiG. 171.—Downy mildew of melons and cucumbers. 1. A spore-bearing thread; sp. young spores; 2, 2' and 2", mature spores of the ordinary form. 3. Spore-bearing thread emerging from an air-pore on a leaf. 4. A cluster of spore-bearing threads taken from a cucumber leaf in dry weather, t, unusual types of spore-bearing threads and spores. 6. A short stalked spore from a muskmelon leaf. 7. Cells of a cucumber leaf with the fungus mycelium between them; sucker threads h, h' and h". 8. An unusual type of spore from the Stock Photo](https://c8.alamy.com/comp/RDE379/minnesota-plant-diseases-plant-diseases-minnesota-plant-diseases-fig-171downy-mildew-of-melons-and-cucumbers-1-a-spore-bearing-thread-sp-young-spores-2-2-and-2quot-mature-spores-of-the-ordinary-form-3-spore-bearing-thread-emerging-from-an-air-pore-on-a-leaf-4-a-cluster-of-spore-bearing-threads-taken-from-a-cucumber-leaf-in-dry-weather-t-unusual-types-of-spore-bearing-threads-and-spores-6-a-short-stalked-spore-from-a-muskmelon-leaf-7-cells-of-a-cucumber-leaf-with-the-fungus-mycelium-between-them-sucker-threads-h-h-and-hquot-8-an-unusual-type-of-spore-from-the-RDE379.jpg ". Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases-. FiG. 171.—Downy mildew of melons and cucumbers. 1. A spore-bearing thread; sp. young spores; 2, 2' and 2", mature spores of the ordinary form. 3. Spore-bearing thread emerging from an air-pore on a leaf. 4. A cluster of spore-bearing threads taken from a cucumber leaf in dry weather, t, unusual types of spore-bearing threads and spores. 6. A short stalked spore from a muskmelon leaf. 7. Cells of a cucumber leaf with the fungus mycelium between them; sucker threads h, h' and h". 8. An unusual type of spore from the Stock Photo")
RMRDE379–. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases-. FiG. 171.—Downy mildew of melons and cucumbers. 1. A spore-bearing thread; sp. young spores; 2, 2' and 2", mature spores of the ordinary form. 3. Spore-bearing thread emerging from an air-pore on a leaf. 4. A cluster of spore-bearing threads taken from a cucumber leaf in dry weather, t, unusual types of spore-bearing threads and spores. 6. A short stalked spore from a muskmelon leaf. 7. Cells of a cucumber leaf with the fungus mycelium between them; sucker threads h, h' and h". 8. An unusual type of spore from the
RMRDE6CT–. The fungi which cause plant disease . Plant diseases; Fungi. 162 THE FUNGI WHICH CAUSE PLANT DISEASE Ascocarps scattered on the leaf, shining black, up to 1 mm. long; asci clavate, 8-spored; spores nearly as long as the ascus, 90-120 X 1.5 M- Conidia cylindric, hyaline, continuous, 6-8 x 1 /t. L. brachysporum Rost. Perithecia epiphyllous; asci cylindric, short- stalked, apex rounded, 120 x 20-25 p., 8- spored; paraphyses bacillar, apex curved; spores oblong, l-rowed, hyaline, 28-30 x 9-10 /x. It is common on pine leaves.^ Several other species are parasitic upon various conifers, among them:
![. Fundamentals of botany. Botany. LIFE HISTORY OF A FERN 159 spores may be formed; a sorus will consist of fuUy lOO sporangia, usually more; 20 is a moderate estimate of the sori on an average pinna; there may be fully so fertile pinnas on one well-developed leaf, and a strong plant would bear 10 fertile leaves. 48 X 100 X 20 X 50 X 10 = 48,000,000. The output of spores on a strong plant in the single season wiU thus, on a moderate estimate, approach the enormous number of fifty millions"- 148. TjT)es of Sporophylls.—In many ferns the leaves serve both vegetative and reproductive function Stock Photo](https://c8.alamy.com/comp/RE36XP/fundamentals-of-botany-botany-life-history-of-a-fern-159-spores-may-be-formed-a-sorus-will-consist-of-fuuy-loo-sporangia-usually-more-20-is-a-moderate-estimate-of-the-sori-on-an-average-pinna-there-may-be-fully-so-fertile-pinnas-on-one-well-developed-leaf-and-a-strong-plant-would-bear-10-fertile-leaves-48-x-100-x-20-x-50-x-10-=-48000000-the-output-of-spores-on-a-strong-plant-in-the-single-season-wiu-thus-on-a-moderate-estimate-approach-the-enormous-number-of-fifty-millionsquot-148-tjtes-of-sporophyllsin-many-ferns-the-leaves-serve-both-vegetative-and-reproductive-function-RE36XP.jpg ". Fundamentals of botany. Botany. LIFE HISTORY OF A FERN 159 spores may be formed; a sorus will consist of fuUy lOO sporangia, usually more; 20 is a moderate estimate of the sori on an average pinna; there may be fully so fertile pinnas on one well-developed leaf, and a strong plant would bear 10 fertile leaves. 48 X 100 X 20 X 50 X 10 = 48,000,000. The output of spores on a strong plant in the single season wiU thus, on a moderate estimate, approach the enormous number of fifty millions"- 148. TjT)es of Sporophylls.—In many ferns the leaves serve both vegetative and reproductive function Stock Photo")
RMRE36XP–. Fundamentals of botany. Botany. LIFE HISTORY OF A FERN 159 spores may be formed; a sorus will consist of fuUy lOO sporangia, usually more; 20 is a moderate estimate of the sori on an average pinna; there may be fully so fertile pinnas on one well-developed leaf, and a strong plant would bear 10 fertile leaves. 48 X 100 X 20 X 50 X 10 = 48,000,000. The output of spores on a strong plant in the single season wiU thus, on a moderate estimate, approach the enormous number of fifty millions"- 148. TjT)es of Sporophylls.—In many ferns the leaves serve both vegetative and reproductive function
![. Diseases of truck crops and their control . Vegetables. Fig. 47. Bean Diseases. a. and fc. Rust on leaf and pods, c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, winter spores, e. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (c. d. and /. after Whetzel). g. Cercospora leaf spot, A. Isariopsis griseola leaf 5T»ot * ''r^nj/^-ephor^ ."Mid conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - Stock Photo](https://c8.alamy.com/comp/RDE0CN/diseases-of-truck-crops-and-their-control-vegetables-fig-47-bean-diseases-a-and-fc-rust-on-leaf-and-pods-c-section-through-bean-leaf-showing-bean-rust-summer-spores-d-section-through-bean-leaf-showing-bean-rust-winter-spores-e-anthracnose-section-through-bean-seed-showing-relation-of-anthracnose-to-the-host-c-d-and-after-whetzel-g-cercospora-leaf-spot-a-isariopsis-griseola-leaf-5tot-rnj-ephor-quotmid-conidia-of-isariopsis-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-RDE0CN.jpg ". Diseases of truck crops and their control . Vegetables. Fig. 47. Bean Diseases. a. and fc. Rust on leaf and pods, c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, winter spores, e. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (c. d. and /. after Whetzel). g. Cercospora leaf spot, A. Isariopsis griseola leaf 5T»ot * ''r^nj/^-ephor^ ."Mid conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - Stock Photo")
RMRDE0CN–. Diseases of truck crops and their control . Vegetables. Fig. 47. Bean Diseases. a. and fc. Rust on leaf and pods, c. section through bean leaf showing bean rust, summer spores, d. section through bean leaf, showing bean rust, winter spores, e. anthracnose, /. section through bean seed, showing relation of anthracnose to the host (c. d. and /. after Whetzel). g. Cercospora leaf spot, A. Isariopsis griseola leaf 5T»ot * ''r^nj/^-ephor^ ."Mid conidia of Isariopsis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
RMRDCXMG–. Manual of fruit diseases . Fruit. CHERRY DISEASES 173 enter the next season with decreased vitahty. A case is on record where 40,000 young cherry trees were lost on account of leaf-bhght alone. The loss in Ohio in 1905 is estimated at $25,000. The preceding year it is estimated to have caused a loss of S per cent, in Maryland. One nursery company in. Fig. 4S. — Leaf-blight (yellow-leaf, or leaf-spot) on sweet cherry; types of lesions on upper and lower surfaces. Center leaf shows whitish masses' (spores) of the pathogene. Nebraska claims to have lost $40,000 in 1903 on account of this diseas
RMRE0M4N–. Experiments with plants. Botany. PLAXTS WHICH CAl'SE BBC AT •iU.'l a mycelium which spreads rapidly through the Iiaf aud finally forms spores known as cluster-cup spr)rH> (or secidiospores). These spores, as their name implies, are arranged in clusters in cup- like cavities of the leaf (Fig. 228), which are produced by their growth. On exam- ining thin sections of the leaf carefully, we see that the cluster-cup spores are in long chains borne on short stalks (Fig. 229). On the upper surface of the leaf occur smaller cavities filled with smaller slender spore-bearing stalks; their function
RMRDWAN3–. Textbook of botany. Botany. THE PIXE 123 We saw that the green leaf of the fern does two kinds of work: it manufactures food and it bears spores. In the pine, these t-n-o kinds of work are performed by two distinct kinds of leaves — the foUage leaves and the spore leaves. The spores borne on the spore leaves of the staminate cone are very small, and so are called microspores; therefore the leaves of the staminate cone are inicrospore lea'ces. The under surface of each microspore leaf (Fig. 71. .4) is nearly covered by two microspore sacs (or pollen sacs); within these sacs a great many micro
RMRDE0MD–. Diseases of truck crops and their control . Vegetables. Fig. 21. Spinach Diseases. a. Downy mildew, b. cross section showing fruiting stalk of t'.ie downy mildew fungus on infected spinach leaf. c. cross section showing leaf affected with white smut, d. Anthracnose of spinach, e. cross section showing acervulus of Colletotri- chum spinacia. f. leaf spot, g. spores of the leaf spot fungus Heterosportum variabile- {b. c. e. after Halsted, d. after Reed).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
![. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P Stock Photo](https://c8.alamy.com/comp/RDE5DK/the-fungi-which-cause-plant-disease-plant-diseases-fungi-fig-336p-solitaria-1-month-old-colony-on-apple-agar-after-scott-and-rorer-the-fimgus-was-grown-in-pure-culture-and-its-identity-on-twig-leaf-and-fruit-was-shown-by-cross-inoculation-p-persicae-sacc-is-common-on-peach-leaves-p-piricola-sacc-amp-speg-is-foimd-on-apple-and-pear-p-limitata-pkquot-is-reported-as-the-cause-of-an-apple-leaf-spot-spots-round-minute-2-6-mm-brown-or-reddish-pycnidia-epiph-yllous-black-few-punctiform-spores-ellipsoid-7-8-x-4-jn-p-mail-p-amp-d-occurs-on-apple-and-pear-p-RDE5DK.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P Stock Photo")
RMRDE5DK–. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P
RMRDD2CF–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. BLECHNUM BLOOMERIA 167 roots, with a drier atmosphere than most other Perns re - quire, to prevent fronds from turning brown during win- ter months. Average temp. 60-65° F. Soil, equal parts of rich loam and leaf-mold or peat. The spores of most Blechnums germinate very freely if sown on a compost of loam and l
RMRDD07C–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 462 DAVALLIA DEAKBORN tion in a temperature of 65-70° and kept moderately moist, a number of small plants will develop from the dormant eyes, which may be separately potted as soon as of sufficient size. Spores of Davallia should be sown on a fine compost of soil, leaf-mold or peat and sand in equal parts, and
RMRDJFE2–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 203 XII. MOLLISIACE^E This family differs from the Helotiaceae largely in texture, the former being tougher, and as a rule made up of hyphal cells modified in a prosenchymatic or fibrous manner. The spores are hyaline and very similar to those of the Helotiacese. The only genus of importance in producing plant diseases is Pseudopeziza.. Fig. 77 a. Alfalfa Leaf Spot. (Photograph by H. H. Whetzel) Pseudopeziza. In this genus the apothecium is formed beneath the epidermis,
![. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 377 Cedar apples of red cedar (Gymnosporangium macropus Link, and G. glohosiLw, Fart.). See Leaf Rust of Apples. Diseases of Orchards and Vineyards. The powdery mildew of lilac [Microsphcera alni {Walk.) IVint.]. This is the very common blight of lilacs which, in the fall, covers lilac leaves with a conspicuous white mycelial coating. The same blight is apparently found on many other plants, as alder, birches, high bush cranberry and others. Summer spores are produced in the usual manner for powdery mildews and the. Fig. 202 Stock Photo](https://c8.alamy.com/comp/RDD8T7/minnesota-plant-diseases-plant-diseases-minnesota-plant-diseases-377-cedar-apples-of-red-cedar-gymnosporangium-macropus-link-and-g-glohosilw-fart-see-leaf-rust-of-apples-diseases-of-orchards-and-vineyards-the-powdery-mildew-of-lilac-microsphcera-alni-walk-ivint-this-is-the-very-common-blight-of-lilacs-which-in-the-fall-covers-lilac-leaves-with-a-conspicuous-white-mycelial-coating-the-same-blight-is-apparently-found-on-many-other-plants-as-alder-birches-high-bush-cranberry-and-others-summer-spores-are-produced-in-the-usual-manner-for-powdery-mildews-and-the-fig-202-RDD8T7.jpg ". Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 377 Cedar apples of red cedar (Gymnosporangium macropus Link, and G. glohosiLw, Fart.). See Leaf Rust of Apples. Diseases of Orchards and Vineyards. The powdery mildew of lilac [Microsphcera alni {Walk.) IVint.]. This is the very common blight of lilacs which, in the fall, covers lilac leaves with a conspicuous white mycelial coating. The same blight is apparently found on many other plants, as alder, birches, high bush cranberry and others. Summer spores are produced in the usual manner for powdery mildews and the. Fig. 202 Stock Photo")
RMRDD8T7–. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 377 Cedar apples of red cedar (Gymnosporangium macropus Link, and G. glohosiLw, Fart.). See Leaf Rust of Apples. Diseases of Orchards and Vineyards. The powdery mildew of lilac [Microsphcera alni {Walk.) IVint.]. This is the very common blight of lilacs which, in the fall, covers lilac leaves with a conspicuous white mycelial coating. The same blight is apparently found on many other plants, as alder, birches, high bush cranberry and others. Summer spores are produced in the usual manner for powdery mildews and the. Fig. 202
![. Minnesota plant diseases. Plant diseases. leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—Ap?le scab on the fimt. After Clmt Stock Photo](https://c8.alamy.com/comp/RDE35A/minnesota-plant-diseases-plant-diseases-leaf-and-these-spots-often-occur-in-sufificient-numbers-to-con-siderably-damage-the-plant-the-winter-spores-are-two-celled-spraying-with-dilute-bordeaux-has-been-recom-mended-just-as-the-buds-are-opening-and-the-leaves-are-expanding-and-at-in-tervals-later-the-fallen-leaves-should-be-burned-i-apple-scab-venturia-pomi-fr-wint-ap-pie-scab-is-by-far-the-most-serious-disease-of-apples-the-fungus-first-appears-in-early-summer-on-the-leaves-of-the-apple-tree-as-light-greyish-circular-fio-ls3aple-scab-on-the-fimt-after-clmt-RDE35A.jpg ". Minnesota plant diseases. Plant diseases. leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—Ap?le scab on the fimt. After Clmt Stock Photo")
RMRDE35A–. Minnesota plant diseases. Plant diseases. leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—Ap?le scab on the fimt. After Clmt
![. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 351 . leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—A Stock Photo](https://c8.alamy.com/comp/RDE35E/minnesota-plant-diseases-plant-diseases-minnesota-plant-diseases-351-leaf-and-these-spots-often-occur-in-sufificient-numbers-to-con-siderably-damage-the-plant-the-winter-spores-are-two-celled-spraying-with-dilute-bordeaux-has-been-recom-mended-just-as-the-buds-are-opening-and-the-leaves-are-expanding-and-at-in-tervals-later-the-fallen-leaves-should-be-burned-i-apple-scab-venturia-pomi-fr-wint-ap-pie-scab-is-by-far-the-most-serious-disease-of-apples-the-fungus-first-appears-in-early-summer-on-the-leaves-of-the-apple-tree-as-light-greyish-circular-fio-ls3a-RDE35E.jpg ". Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 351 . leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—A Stock Photo")
RMRDE35E–. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 351 . leaf and these spots often occur in sufificient numbers to con- siderably damage the plant. The winter spores are two-celled. Spraying with dilute bordeaux has been recom- mended just as the buds are opening and the leaves are expanding, and at in- tervals later. The fallen / leaves should be burned, i * Apple scab [Venturia |* pomi (Fr.) Wint.]. Ap- ^ pie scab is by far the most serious disease of apples. The fungus first appears in early summer on the leaves of the apple tree as light, greyish, circular Fio. lS3.—A
RMRDJ5N1–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. AUTOBASIDIOMYCETES 441 distortions on young shoots of Andromeda lignstrina. Galls of this latter form are hollow, bag-like structures which may attain a length of five or six inches. Richards employed the large form on Andromeda and Exo- basidium Vaccinii in some cross inoculations and was able to develop the leaf spot form of the gall on Andromeda from Exo- basidium Vaccinii, and also to produce this same form through spores from the galls on Andromeda. He also directs attention t
RMRDE33W–. Minnesota plant diseases. Plant diseases. 362 Minnesota Plant Diseases. palisade fashion on the surface of the pocket. Each sac contains about eight spores, which on germination may directly cause in- fection of a host plant. The fungus of this disease is very closely related to the peach leaf-curl fungus and to others forming witches'-broom on birch, alder and cherry trees. It is a sac- fungus with an arrangement of sacs similar to that in the true cup fungi, but has no true cup, since the sacs occur directly on the tissues of the host.. Fig. 193.—Plum pockets. These plums are devoid of sto
![. Minnesota plant diseases. Plant diseases. 376 Minnesota Plant Diseases. not unlike a smut mass. The spore mass is black and powdery and the spores are, in general features, similar in appearance to the winter spores of the leaf rust. Infected plant parts should be destroyed before the spores have a chance to disperse. The Indian turnip leaf rust [Uromyces caladii (Schw.) Farl.]. This rust is sometimes found on cultivated Aroids. (See Dis- eases of Wild Plants.) Golden-rod and aster leaf rust [Coleosporium sonchi-ar- vensis ( Pers.) Lev.]. The g-olden-rod rust is an exceed- ingly abundant dis Stock Photo](https://c8.alamy.com/comp/RDD8T9/minnesota-plant-diseases-plant-diseases-376-minnesota-plant-diseases-not-unlike-a-smut-mass-the-spore-mass-is-black-and-powdery-and-the-spores-are-in-general-features-similar-in-appearance-to-the-winter-spores-of-the-leaf-rust-infected-plant-parts-should-be-destroyed-before-the-spores-have-a-chance-to-disperse-the-indian-turnip-leaf-rust-uromyces-caladii-schw-farl-this-rust-is-sometimes-found-on-cultivated-aroids-see-dis-eases-of-wild-plants-golden-rod-and-aster-leaf-rust-coleosporium-sonchi-ar-vensis-pers-lev-the-g-olden-rod-rust-is-an-exceed-ingly-abundant-dis-RDD8T9.jpg ". Minnesota plant diseases. Plant diseases. 376 Minnesota Plant Diseases. not unlike a smut mass. The spore mass is black and powdery and the spores are, in general features, similar in appearance to the winter spores of the leaf rust. Infected plant parts should be destroyed before the spores have a chance to disperse. The Indian turnip leaf rust [Uromyces caladii (Schw.) Farl.]. This rust is sometimes found on cultivated Aroids. (See Dis- eases of Wild Plants.) Golden-rod and aster leaf rust [Coleosporium sonchi-ar- vensis ( Pers.) Lev.]. The g-olden-rod rust is an exceed- ingly abundant dis Stock Photo")
RMRDD8T9–. Minnesota plant diseases. Plant diseases. 376 Minnesota Plant Diseases. not unlike a smut mass. The spore mass is black and powdery and the spores are, in general features, similar in appearance to the winter spores of the leaf rust. Infected plant parts should be destroyed before the spores have a chance to disperse. The Indian turnip leaf rust [Uromyces caladii (Schw.) Farl.]. This rust is sometimes found on cultivated Aroids. (See Dis- eases of Wild Plants.) Golden-rod and aster leaf rust [Coleosporium sonchi-ar- vensis ( Pers.) Lev.]. The g-olden-rod rust is an exceed- ingly abundant dis
![. Minnesota plant diseases. Plant diseases. ;74 Minnesota Plant Diseases. occurs on other more or less closely related plants. The fungus mycelium gains entrance to the plant in the spring and first pro- duces cluster cups. These are followed by the summer spores, throughout the summer months, forming small red-brown patches. ]"lG. 199.—Leaf rust of roses. The cluster-cup stage on the stems and leaves. On left is a stem distorted by the cluster-cup cushions. Photograph by H. Cuzner upon large, dark, red-brown spots in great abundance, on the lower surface of the leaves. The summer-spores Stock Photo](https://c8.alamy.com/comp/RDEW29/minnesota-plant-diseases-plant-diseases-74-minnesota-plant-diseases-occurs-on-other-more-or-less-closely-related-plants-the-fungus-mycelium-gains-entrance-to-the-plant-in-the-spring-and-first-pro-duces-cluster-cups-these-are-followed-by-the-summer-spores-throughout-the-summer-months-forming-small-red-brown-patches-quotlg-199leaf-rust-of-roses-the-cluster-cup-stage-on-the-stems-and-leaves-on-left-is-a-stem-distorted-by-the-cluster-cup-cushions-photograph-by-h-cuzner-upon-large-dark-red-brown-spots-in-great-abundance-on-the-lower-surface-of-the-leaves-the-summer-spores-RDEW29.jpg ". Minnesota plant diseases. Plant diseases. ;74 Minnesota Plant Diseases. occurs on other more or less closely related plants. The fungus mycelium gains entrance to the plant in the spring and first pro- duces cluster cups. These are followed by the summer spores, throughout the summer months, forming small red-brown patches. ]"lG. 199.—Leaf rust of roses. The cluster-cup stage on the stems and leaves. On left is a stem distorted by the cluster-cup cushions. Photograph by H. Cuzner upon large, dark, red-brown spots in great abundance, on the lower surface of the leaves. The summer-spores Stock Photo")
RMRDEW29–. Minnesota plant diseases. Plant diseases. ;74 Minnesota Plant Diseases. occurs on other more or less closely related plants. The fungus mycelium gains entrance to the plant in the spring and first pro- duces cluster cups. These are followed by the summer spores, throughout the summer months, forming small red-brown patches. ]"lG. 199.—Leaf rust of roses. The cluster-cup stage on the stems and leaves. On left is a stem distorted by the cluster-cup cushions. Photograph by H. Cuzner upon large, dark, red-brown spots in great abundance, on the lower surface of the leaves. The summer-spores
RMRDE4XX–. The fungi which cause plant disease . Plant diseases; Fungi. 622 THE FUNGI WHICH CAUSE PLANT DISEASE flask-shaped, strongly constricted at the septa, olive, 40-60 x 10-17 n. Circular leaf-spots are produced on violets. Spores are found on the spots only when conditions are most favorable, i. e., in a humid air. The parasitism of the fungus was demonstrated by inocula- tion with spores on living leaves in distilled water. A. panax Whet.^^e Spots amphigenous, circular, becoming dingy white with a. Fig. 420.—Alter- n a r i a. Spores and spore-bear- ing stalks. Af- ter van Hook.. Please note tha
RMRDDAW2–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 277 globose, with a short, conical ostiole, walls black, carbonous to leathery; asci cylindric, 8-spored; spores elliptic, continuous, brown, imappendaged; paraphyses usually present. Over one hundred species, chiefly sapro- phytes. A. sullae Montem. occurs as the cause of a leaf spot on sulla.^** Fig. 206.—a. des- A. bohiensis (Hmp.) Speg. is on cacao; Z^g,I'^^ut^^S; A. destruens Sh. on cranberry; spores; 11, germi- Dating spore. After A. coffese Desm. on coffee.™* ^^ Shear. Valsaceae (p. 223) S
RMRDDB89–. The fungi which cause plant disease . Plant diseases; Fungi. 246 THE FUNGI WHICH CAUSE PLANT DISEASE. FiQ. 180.—M. sentina, Septona stage. Portion of a section through a pear leaf spot, showing e, e, epidermis; p, pali- sade cells sp, spongy parenchyma; o, S. piricola pycnidium, giving out spores, b. After Longyear. M. sentina (Fr.) Schr. Perithecia, 80-110 /i; on dead spots of leaves, the long ostiole erumpent; asci clavate, 60-75 x 11-13 fi, colorless; spores fusiform, curved or straight, 26-33 x Conidia (=Septoria piricola) borne in pycnidia which are similar in size and form to the perit
RMRE1GH3–. Fungi; their nature, influence, and uses;. Fungi. 144 FUNGI. end of its vegetation. The two forms of spores in this genus are constantly found on the same leaf, and in the same pulvinule, but generally the pulverulent spores abound at the commence- ment of the summer. The reniform sporules begin to germinate in a great number as soon as they are free; some few extend a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Cook
RMRDHRXH–. Fungi; their nature and uses. Fungi. 144 FUNGI. end of its vegetation. The two forms of spores in this genus are constantly found on the same leaf, and in the same pulvinule, but generally the pulverulent spores abound at the commence- ment of the summer. The reniform sporules begin to germinate in a great number as soon as they are free ; some few extend a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Cooke, M. C. (Mo
RMRDTJ2M–. Introduction to structural and systematic botany, and vegetable physiology. Botany. 604 ILLUSTRATIONS OF THE NATURAL ORDERS. lid, containing spores usually mixed with elaters (which are thin, thread-like cells, containing one or two spiral fibres, uncoiling elas- tically at maturity). Vegetation sometimes frondose, i. e. the stem and leaves confluent into an expanded leaf-like mass ; sometimes foliaceous, when the leaves are distinct from the stem, as in true Mosses: the leaves are entire or cleft, two-ranked, and often with an imperfect qr rudimentary row (amphiffastria) on the under side o
![. Horticulture; a text book for high schools and normals. Gardening; Vegetable gardening; Fruit-culture. Fiq. 125.—Bust on apple leaf somewhat enlarged, showing the cup-like fungous growth, (Indiana Station.). Fig. 126.—Apple rust fungus on the cedar, called "cedar apple." Spores from this gener- ation infest the apple, as shown. (Indiana Station.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davis, Kary Cadmu Stock Photo](https://c8.alamy.com/comp/RDXN8H/horticulture-a-text-book-for-high-schools-and-normals-gardening-vegetable-gardening-fruit-culture-fiq-125bust-on-apple-leaf-somewhat-enlarged-showing-the-cup-like-fungous-growth-indiana-station-fig-126apple-rust-fungus-on-the-cedar-called-quotcedar-applequot-spores-from-this-gener-ation-infest-the-apple-as-shown-indiana-station-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-davis-kary-cadmu-RDXN8H.jpg ". Horticulture; a text book for high schools and normals. Gardening; Vegetable gardening; Fruit-culture. Fiq. 125.—Bust on apple leaf somewhat enlarged, showing the cup-like fungous growth, (Indiana Station.). Fig. 126.—Apple rust fungus on the cedar, called "cedar apple." Spores from this gener- ation infest the apple, as shown. (Indiana Station.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davis, Kary Cadmu Stock Photo")
RMRDXN8H–. Horticulture; a text book for high schools and normals. Gardening; Vegetable gardening; Fruit-culture. Fiq. 125.—Bust on apple leaf somewhat enlarged, showing the cup-like fungous growth, (Indiana Station.). Fig. 126.—Apple rust fungus on the cedar, called "cedar apple." Spores from this gener- ation infest the apple, as shown. (Indiana Station.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davis, Kary Cadmu
RMRDXRWW–. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. Fig. 102, ^ 1. I^eaf of Cheat, showing numerous small specks, the perithecia of Septoria Bromi, the spores in the perithecia shown at 2. [%'V.n^:'i^:^^l.:- ;,:-';-.;i±l-.:.l.!'A' In a somewhat extended account of this disease Cobb states that the entire plant is not always involved. The fungus is variable, its character depending upon the host which it attacks. On Poa annua the leaf is mainly involved and in many cases is totally d
RMRDXT58–. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. EUTHAI.LEPHYTA—EUMYCETES—RUSTS 231. Fig. 67. Qover Sust. Uromyces Trifolii. (Hedw.) I,ev. 1. Aecidium spores; above,, two cluster cups in which the aecidiospores are found. 2. White clover leaf showing the distortions produced by the aecidium stage. 3. Red clover leaf showing clusters of uredo spores. 4. Uredo spores. 5. Teleuto spores. 6. An uredo cluster more magnified than in 3. Figs. 1, 2, and 3 after Miss Howell. Remainder by Mi
Search Results for Spores on leaf Black & White Stock Photos and Images (266)
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