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Leaf with spores Stock Photos and Images
RF2K9553F–Diseases of coniferous trees - parasites of pine wood scleroderriosis, pine spinner, sclerophomosis and diplodiasis. aphids on the trunk and branches of pine, diseases and pests of trees and plants
RMMCK5GY–. Fio. 108.—Mamiana fimhriata on Carpinus Bclulas. Leaf of Hornbeam seen on lower surface. Stroma (enlarged), with the long black necks of the perithecia projecting from the ruptured leaf-epidermis, (v. Tubeuf del.) Valsa. A stroma is generally present, but is of very variable appear- ance ; embedded in it are the perithecia, with only their beak- like mouths projecting. The spores are hyaline or light-brown, unicellular, and generally bent. Xo paraphyses are present. Valsa oxystoma Pichm.- This causes disease and death of branches of A/iws 'cirulis in the Alps. The symptoms are withering and
![Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] GNOMONIA 20I phore, 14-20X1-1-5 /t. Perithecia of ascigerous form with an ostiolum or beak projecting beyond surface of leaf; asci 8-spored; spores liyaline, narrowly ovate, i-septate below the middle, 16-18 X 5-6 /x. Collecting and burning all the hanging leaves during winter is the only practical method of stamping out the disease. This practice, however, should be general in an infected district, otherwise it is of little avail, as the spores are blown Fig. 55.—Gnomonia er Stock Photo](https://c8.alamy.com/comp/T1HJ9W/diseases-of-cultivated-plants-and-diseases-of-cultivated-plants-and-trees-diseasesofcultiv00massuoft-year-1910-gnomonia-20i-phore-14-20x1-1-5-t-perithecia-of-ascigerous-form-with-an-ostiolum-or-beak-projecting-beyond-surface-of-leaf-asci-8-spored-spores-liyaline-narrowly-ovate-i-septate-below-the-middle-16-18-x-5-6-x-collecting-and-burning-all-the-hanging-leaves-during-winter-is-the-only-practical-method-of-stamping-out-the-disease-this-practice-however-should-be-general-in-an-infected-district-otherwise-it-is-of-little-avail-as-the-spores-are-blown-fig-55gnomonia-er-T1HJ9W.jpg "Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] GNOMONIA 20I phore, 14-20X1-1-5 /t. Perithecia of ascigerous form with an ostiolum or beak projecting beyond surface of leaf; asci 8-spored; spores liyaline, narrowly ovate, i-septate below the middle, 16-18 X 5-6 /x. Collecting and burning all the hanging leaves during winter is the only practical method of stamping out the disease. This practice, however, should be general in an infected district, otherwise it is of little avail, as the spores are blown Fig. 55.—Gnomonia er Stock Photo")
RMT1HJ9W–Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] GNOMONIA 20I phore, 14-20X1-1-5 /t. Perithecia of ascigerous form with an ostiolum or beak projecting beyond surface of leaf; asci 8-spored; spores liyaline, narrowly ovate, i-septate below the middle, 16-18 X 5-6 /x. Collecting and burning all the hanging leaves during winter is the only practical method of stamping out the disease. This practice, however, should be general in an infected district, otherwise it is of little avail, as the spores are blown Fig. 55.—Gnomonia er
RM2AJ1BK1–Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products . Fig. 48 Fig. 49 eventually becomes black. In Fig. 48 are shown the spores after Kriiger.Their length is from 19-6 to 40 microns, with an average of 25-2 microns,and with a breadth of 7 microns. The disease has been reported from Java,British Guiana, Porto Rico, Santo Domingo, Cuba, Jamaica, Louisiana andIndia. Black Spot of the Leaf Base. ^ Cercospora acerosum (Dickoff and Hein).—Thisdisease causes a blackening of the leaf base. The spores, shown in Fig. 49, TH
RMPG1WTX–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. 130. chrysomyxa Rhododendri in a leaf of Rh. hirsutttm. Vertical section through a teleutospore-layer. e—€ epidermis of the under surface of the leaf. Adjoining the spores is the tissue of the leaf traversed and distorted by mycelial filaments m of Chrysomyxa; a a row of teleutospores which have not yet germinated; / a similar row in which the uppermost teleutospore has formed a promycelium, and on this sterigmata and sporidia are beginning to be formed in basipe
RMACWPEP–Golden polypody, Golden serpent fern, Cabbage palm fern (Phlebodium aureum, Polypodium aureum), fronds
RF2K6R7KR–Diseases of coniferous trees - parasites of pine wood scleroderriosis, pine spinner, sclerophomosis and diplodiasis. aphids on the trunk and branches of pine, diseases and pests of trees and plants
RMMCK51W–. Fig. ZW.—Cephaleuros Mycoidea. Section through part of an attacked leaf of Camellia. The epidermal layer has been ruptured, and haustoria from the algal disc penetrate to the tissues. The dark-shaded portion is that killed by the alga. (After Cunningham.) the older ones ; in addition, sporangial structures are also developed and give off biciliate swarm-spores. The discs form a kind of cuticle which becomes completely fused with that of the leaves. ^ Karsten, Annal. diijardin. hotan. de Buitenzorg, Vol. x., 1891. -Cunningham, Trana. of Linnean Soc. of London, 1880; H. M. Ward [idem), 1884.
![Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 348 DISEASES OF CULTIVATED PLANTS Onion smut {UrocysHs cepulae. Frost) is only known to attack cultivated onions, and develops during the seedling stage. As a rule the first leaf shows the disease before the second leaf appears : the disease attacks the leaves in the order of their appearance. The outer coat of the bulb is P'iG. 104. — Urocystis occulta. i, upper part of rye plant diseased ; 2, spores, one of w hich has germinated and produced a cluster of secondary spores at Stock Photo](https://c8.alamy.com/comp/T1JEC1/diseases-of-cultivated-plants-and-diseases-of-cultivated-plants-and-trees-diseasesofcultiv00massuoft-year-1910-348-diseases-of-cultivated-plants-onion-smut-urocyshs-cepulae-frost-is-only-known-to-attack-cultivated-onions-and-develops-during-the-seedling-stage-as-a-rule-the-first-leaf-shows-the-disease-before-the-second-leaf-appears-the-disease-attacks-the-leaves-in-the-order-of-their-appearance-the-outer-coat-of-the-bulb-is-pig-104-urocystis-occulta-i-upper-part-of-rye-plant-diseased-2-spores-one-of-w-hich-has-germinated-and-produced-a-cluster-of-secondary-spores-at-T1JEC1.jpg "Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 348 DISEASES OF CULTIVATED PLANTS Onion smut {UrocysHs cepulae. Frost) is only known to attack cultivated onions, and develops during the seedling stage. As a rule the first leaf shows the disease before the second leaf appears : the disease attacks the leaves in the order of their appearance. The outer coat of the bulb is P'iG. 104. — Urocystis occulta. i, upper part of rye plant diseased ; 2, spores, one of w hich has germinated and produced a cluster of secondary spores at Stock Photo")
RMT1JEC1–Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 348 DISEASES OF CULTIVATED PLANTS Onion smut {UrocysHs cepulae. Frost) is only known to attack cultivated onions, and develops during the seedling stage. As a rule the first leaf shows the disease before the second leaf appears : the disease attacks the leaves in the order of their appearance. The outer coat of the bulb is P'iG. 104. — Urocystis occulta. i, upper part of rye plant diseased ; 2, spores, one of w hich has germinated and produced a cluster of secondary spores at
RM2AJ1B72–Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products . Fig. 48 Fig. 49 eventually becomes black. In Fig. 48 are shown the spores after Kriiger.Their length is from 19-6 to 40 microns, with an average of 25-2 microns,and with a breadth of 7 microns. The disease has been reported from Java,British Guiana, Porto Rico, Santo Domingo, Cuba, Jamaica, Louisiana andIndia. Black Spot of the Leaf Base. ^ Cercospora acerosum (Dickoff and Hein).—Thisdisease causes a blackening of the leaf base. The spores, shown in Fig. 49, TH
![. Plant studies; an elementary botany. Botany. 2Y2 PLANT STUDIES fiiKilly deadened spots on the leaves, where the tissues have been killed. From this internal mycelium numerous sporojihores arise, coming to the surface of tlie host and securing the scattering of their spores, which fall u])on other leaves and germinate, the new niycelia pene- trating among the tissues and begin- ning their ravages. The sporophores, af- ter rising above the surface of the leaf, branch freely; and many of them risiiig near together, they form little velvety patches on the surface, suggesting the name " down Stock Photo](https://c8.alamy.com/comp/PG3D31/plant-studies-an-elementary-botany-botany-2y2-plant-studies-fiikilly-deadened-spots-on-the-leaves-where-the-tissues-have-been-killed-from-this-internal-mycelium-numerous-sporojihores-arise-coming-to-the-surface-of-tlie-host-and-securing-the-scattering-of-their-spores-which-fall-u-on-other-leaves-and-germinate-the-new-niycelia-pene-trating-among-the-tissues-and-begin-ning-their-ravages-the-sporophores-af-ter-rising-above-the-surface-of-the-leaf-branch-freely-and-many-of-them-risiiig-near-together-they-form-little-velvety-patches-on-the-surface-suggesting-the-name-quot-down-PG3D31.jpg ". Plant studies; an elementary botany. Botany. 2Y2 PLANT STUDIES fiiKilly deadened spots on the leaves, where the tissues have been killed. From this internal mycelium numerous sporojihores arise, coming to the surface of tlie host and securing the scattering of their spores, which fall u])on other leaves and germinate, the new niycelia pene- trating among the tissues and begin- ning their ravages. The sporophores, af- ter rising above the surface of the leaf, branch freely; and many of them risiiig near together, they form little velvety patches on the surface, suggesting the name " down Stock Photo")
RMPG3D31–. Plant studies; an elementary botany. Botany. 2Y2 PLANT STUDIES fiiKilly deadened spots on the leaves, where the tissues have been killed. From this internal mycelium numerous sporojihores arise, coming to the surface of tlie host and securing the scattering of their spores, which fall u])on other leaves and germinate, the new niycelia pene- trating among the tissues and begin- ning their ravages. The sporophores, af- ter rising above the surface of the leaf, branch freely; and many of them risiiig near together, they form little velvety patches on the surface, suggesting the name " down
RF2M243D4–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCKC41–. Fig. 140. — Cladosporinmfulvum. i, under surface of a diseased leaf; 2, a cluster of conidiophores bearing conidia, highly mag, half Strength Bordeaux mixture. Spraying, however, is cl but little use unless commenced at an early stage of the dis- ease. Remove and burn plants that are badly diseased, as the spores diffuse quickly, and an epidemic that cannot be checked is the result of negligence. Gummosis of Prunus japonica {Cladosporium epiphylbun, Fr.) either killed or severely injured a considerable number of examples of the beautiful flowering shrub, Primus japonica, growing in Kew Garde
RMT1J1DT–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 '-s; Fio. lOS.—Mamiana fimhriala on Carpinus Setv.lv.s. Leaf of Hornbeam seen on lower surface. Stroma (enlarged), with the long black necks of the perithecia projecting from the ruptured leaf-epidermis, (v. Tubeuf del.) Valsa. A stroma is generally present, but is of very variable appear- ance ; embedded in it are the perithecia, with only their beak- like mouths projecting. The spores are hyalin
RM2AJ536H–Fungous diseases of plants . roduced on stems andtwigs (Fig. 198), and the uredoand teleuto stages occur alsoon the leaf-like branches. Theaecidial stage may appear atalmost any point in the United States with a growing season no shorter than that of northernNew Jersey. The secidia appear in rather long, light green,cushion-like areas. They are short-cylindrical, with a white perid-ium, and the spores appear orange colored from the contents;the wall, however, is hyaline and granulose. The spores meas-ure I 5-18/A in diameter. They may germinate immediately, andwhen dry, some at least retain th
RMPG4260–. Botany for agricultural students . Botany. Fig. 382. — A portion of a leaf of the Interrupted Fern {Osmunda Claytonia), showing a pair of vegetative leaflets above and below and between them two pairs of spore-bearing leaflets.. Fig. 383. — The Sensitive Fern (Onoclea sensibilis), showing a vegetative frond at the left and a spore-bear- ing frond at the right. of considerable significance because it is characteristic of Seed Plants. Gametophyte. — When the spores are shed and fall in moist places, the protoplasm breaks the spore wall and begins the de- velopment which results in the producti
RF2M8F8J5–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCMFWH–. Fig. 25.—Basidiospora entospora. 2, 3, Sclerospora graminis, conidial stage and oospore ; 4, Bremia lactucae, portion of conidial stage. All highly mag. yellowish-green patches on the upper surface of the leaf. Corresponding areas on the under surface soon become covered with a delicate greyish mildew; these patches continue to increase in size, and run into each other, until finally the entire under surface is covered with mildew. Soon after this stage has been reached the leaf turns yellow, then brown, dries up and falls, but not before myriads of spores have been
![Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] Rock fern, polypody. Notice the underground stem giving off roots {R) from its under surface, and leaves (C) from the upper surface. .The com- pound leaf or frond may bear sori (5) on the under side of the leaflets. Section of sorus; s, sporangia; i, indusium, or covering; b, blade of the leaf. — Wossidlo. If fresh material is obtainable, it will be possible to see how the spores get out of the sporangium. A drop of glycerine run Stock Photo](https://c8.alamy.com/comp/RWPMM1/elements-of-biology-a-practical-elements-of-biology-a-practical-text-book-correlating-botany-zoology-and-human-physiology-elementsofbiolog00hunt-year-c1907-rock-fern-polypody-notice-the-underground-stem-giving-off-roots-r-from-its-under-surface-and-leaves-c-from-the-upper-surface-the-com-pound-leaf-or-frond-may-bear-sori-5-on-the-under-side-of-the-leaflets-section-of-sorus-s-sporangia-i-indusium-or-covering-b-blade-of-the-leaf-wossidlo-if-fresh-material-is-obtainable-it-will-be-possible-to-see-how-the-spores-get-out-of-the-sporangium-a-drop-of-glycerine-run-RWPMM1.jpg "Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] Rock fern, polypody. Notice the underground stem giving off roots {R) from its under surface, and leaves (C) from the upper surface. .The com- pound leaf or frond may bear sori (5) on the under side of the leaflets. Section of sorus; s, sporangia; i, indusium, or covering; b, blade of the leaf. — Wossidlo. If fresh material is obtainable, it will be possible to see how the spores get out of the sporangium. A drop of glycerine run Stock Photo")
RMRWPMM1–Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] Rock fern, polypody. Notice the underground stem giving off roots {R) from its under surface, and leaves (C) from the upper surface. .The com- pound leaf or frond may bear sori (5) on the under side of the leaflets. Section of sorus; s, sporangia; i, indusium, or covering; b, blade of the leaf. — Wossidlo. If fresh material is obtainable, it will be possible to see how the spores get out of the sporangium. A drop of glycerine run
RM2AJ5EX2–Fungous diseases of plants . Fig. 143. Cercospor.-i Beticola:Conidiophores and Conidia FUNGI IMPERFECTI I I as in a moist chamber, the length mentioned may be considerablyexceeded. After the death of a leaf, spores may be produced overthe entire surface. Spores found upon old leaves in the field fivemonths 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 mycelium develops in agar as a dense olivac
RMPG4DMJ–. The fungal diseases of the common larch . Larches. 174 LEAF AND SEEDLING DISEASES to live till the spring and then to send out a small germ tube of limited growth, called the promycelium, and this bears a few, generally four, very small spores, which are known as sporidia. The sporidia are very light, and being lifted by the wind settle on the leaves of neighbouring plants. But, though they may germinate, they inevitably perish imless they happen to come in contact with a plant. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
RMAMBBRR–Japanese Holly Farn (Cyrtomium falcatum, Polysticum falcatum), leaves detail with sporangis
RMMX3Y1J–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2M9EBBB–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCK6FB–. Fig. 215.—Cronartium asclepiadnnn. Section of a Cynanchum leaf. The leaf-parenchyma is permeated with mycelium, and sori are formed on the lower epidermis. A, uredo-sorus ; B, televitospore-sorus, many spores of which have germinated and given off promycelia with sporidia. (v. Tubeuf del.) Brown spots may be found on the leaves of the Cynanchinn'^ during July, August, and September (Fig. 214). On examina- tion of the spots with a lens, the leaf-epidermis will be found ^A very common plant in Europe though not indigenous to Britain. (Edit.)
RMT1HE2H–Diseases of glasshouse plants (1923) Diseases of glasshouse plants diseasesofglassh1923bewl Year: 1923 DISEASES DUE TO FUNGI 109 soon die and hang down the stem. Tiny heaps of spores are produced on the diseased areas on both sides of the leaf. Control is a difficult matter, and infected plants should be destroyed immediately. Spraying with a copper fungicide is recommended as a means of protecting the healthy plants. Powdery Mildew of the Chrysanthemum.—Chrysan- themums grown under glass frequently suffer from this disease, due to Oidium chrysanthemi Robh. The leaves become covered with a w
RM2AWMBGB–Journal of agricultural research . ^ i/O/A.. Fig. I.—Cercospora beticola: A, Section of overwintered sugar-beet leaf showing embedded sclerotia-likebody, a, with a mass of old conidiophores, b, from which a new conidium, c, was produced. B. Produc-tion of rather typical conidiophores, b, and conidia, c, from a sclerotia-like mass, a, taken from over-wintered hst material and placed in hanging-drop cultures. Apr. 3, 1916 Climatic Conditions and Cercospora beticola 23 CONIDIA Thiimen (1886, p. 50-54) ^ believed that the spores of Cercospora beti-cola are able to live for a certain length of ti
RMPG4AR3–. Botany for agricultural students . Botany. BLACK RUST OF GRAIN (PUCCINIA GRAMINIS) 399. Fig. 356. — Stage of the Wheat Rust on the Barberry bush, BcrherU vulgaris. Left, leaf of Barberry, showing the affected areas which are red- dish, much thickened, and contain many cup-like depressions; right, a very much enlarged section through the affected area of the leaf, showing one of the cups (c) with chains of aecidiospores (X 200). The very small spores at (p) are the spermatia or pycniospores.. Please note that these images are extracted from scanned page images that may have been digitally enh
RMMX3Y1C–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2KEWDTJ–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCJF22–. Improved Ostrich Plume Fern. A Beautiful New Fern. PTERIS CHILDSII. The most beautiful of all the Pteris, and as it produces no spores it can only be propagated by division, and will always be scarce. It is a strong grower, and makes handsome specimens for the exhibition table. The fronds are large, with the pinnae deeply dentated and undulated on the edges and crested lips. $1.00 each. FICUS LITESCENS (Mistletoe Fig,. A new species which is especially interesting on account of its free and prolific fruiting qualities, it bearing at each leaf axil a small fig, which, at first green, changes
![Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] NECTRIA â 79 brittle. Experiments have proved that the ascospores when placed on the young leaves, germinate, enter the tissues, and give origin to the disease. give origin to the disease. Ascigerous form. Stromata flattened, developed on under surface of the leaf, reddish, then orange-brown, osti Fig. 46.âPolystigma rubrum. i, diseased plum leaves; 2, section through stroma showing perithecia ; 3, asci containing spores ; 4, spermatia produced in spermogonia. Fig. i reduced Stock Photo](https://c8.alamy.com/comp/T1HHBM/diseases-of-cultivated-plants-and-diseases-of-cultivated-plants-and-trees-diseasesofcultiv00massuoft-year-1910-nectria-79-brittle-experiments-have-proved-that-the-ascospores-when-placed-on-the-young-leaves-germinate-enter-the-tissues-and-give-origin-to-the-disease-give-origin-to-the-disease-ascigerous-form-stromata-flattened-developed-on-under-surface-of-the-leaf-reddish-then-orange-brown-osti-fig-46polystigma-rubrum-i-diseased-plum-leaves-2-section-through-stroma-showing-perithecia-3-asci-containing-spores-4-spermatia-produced-in-spermogonia-fig-i-reduced-T1HHBM.jpg "Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] NECTRIA â 79 brittle. Experiments have proved that the ascospores when placed on the young leaves, germinate, enter the tissues, and give origin to the disease. give origin to the disease. Ascigerous form. Stromata flattened, developed on under surface of the leaf, reddish, then orange-brown, osti Fig. 46.âPolystigma rubrum. i, diseased plum leaves; 2, section through stroma showing perithecia ; 3, asci containing spores ; 4, spermatia produced in spermogonia. Fig. i reduced Stock Photo")
RMT1HHBM–Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] NECTRIA â 79 brittle. Experiments have proved that the ascospores when placed on the young leaves, germinate, enter the tissues, and give origin to the disease. give origin to the disease. Ascigerous form. Stromata flattened, developed on under surface of the leaf, reddish, then orange-brown, osti Fig. 46.âPolystigma rubrum. i, diseased plum leaves; 2, section through stroma showing perithecia ; 3, asci containing spores ; 4, spermatia produced in spermogonia. Fig. i reduced
RM2AG646E–. Elementary principles of agriculture; a text book for the common schools. a stalk. Two germinating SHOWS a SpOrO 01 thespores (a, b) piercing the epidermis, and j. x ur i j. • j. the threads penetrating the cells of the potatO blight germmat- leaf. Highly magnifieoT • i n rni n . mg on a leaf. The firstthread soon enters the plant and absorbs the moistureand food substance of the potato leaf. It soon forms acrop of spores, sometimes in only a few days. Thesespores are blown to otherplants, and soon a wholefield will be blighted by thefungus. Most species of fungigrow on only one kind ofplant
RMPG04J7–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 538 MOSSES AND FERNS CHAP. the leaf, the ligula. The spores are of two kinds, borne in sepa- rate sporangia. The outer leaves of each cycle produce micro- spores, the inner ones macrospores, many times larger than the former. The innermost leaves, which are not usually perfectly developed, are sterile, and separate one year's growth from the next. In some of the land forms, e. g., I. hystrix, these sterile leaves are very much reduced, and form spine-like structures. The Gametophyte The germin
RMMX3Y1N–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2KRGYDC–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCWYR8–. Figure 12. Mildew spots on Shade leaf in the field. (One-third natural size.) In the decaying leaves which fall to the ground, spores of another type, thick-shelled winter spores (Figure 2, D), are developed which are resistant to adverse weather conditions, remain in the soil all winter and germinate to start the disease again the next spring. Eifect of the Weather. Mildew comes on suddenly and disappears as suddenly. Some years it is very destructive; other seasons it causes little or no damage. Sometimes it spreads with almost unbelievable rapidity, and again it remains stationary. Its er
RMT1JGND–Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Ornamental Plants 419 loss occasioned by the diminution in vigor of the plant and consequent imperfection of bloom is large. The sori, 2-3 mm. in diameter, which are diagnostic, first appear as small blisters covered by the epidermis. The rupture of this covering dis- closes a dark brown mass of spores. The sori are usually numerous upon the lower leaf surface, and the spores form dusty coatings upon the leaves. Badly affected leaves curl; shrivel, and die. The plants are dwarfed and fail to prod
RM2AG3PPP–. Report of the State Entomologist on injurious and other insects of the state of New York. PORIA RADICULOSA (Peck) Sacc. Plate 17 Poria semitincta (Peck) Sacc. 1 Specimens from the type collection, x i. a Growing on the surface of a dead fallen leaf.b Growing on rotten wood. 2 Specimen in New York State Museum herbarium, collected at South Bethlehem, N. Y. x i. 3 Microphotograph of vertical section through hymenium. x i6o. 4 Single hypha from the trama. 5 Hyphae from the subiculum and the growing margin. This type also represented in the trama. 6 Mature spores. 154 N. Y. State Botanists Repor
RMPG3XYB–. Manual of fruit diseases . Fruit. STRAWBERRY DISEASES 423 amass themselves beneath the cuticle of either surface of the leaf, and from these masses conidiophores bearing conidia arise. These spores develop, are scattered and produce in- fections through- out the summer; with the advent of winter conidial formation ceases, but the mycelium remains alive in the leaves until the following spring. At this time a new crop of conidia develop, which begin the cycle anew by in- fecting again the strawberry plants. Should any of these spores per- chance fall on the common cinquefoil, the disease woul
RMCNRG5A–sweet mountain fern (Oreopteris limbosperma, Thelypteris limbosperma), detail of a frond with sporangia, Germany, North Rhine-Westphalia
RMMX3Y17–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2M61909–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCKX33–. Fig. 13.—Flag smut of wheat. Dark stripes running lengthwise of the leaves and twisted sheaths break open, shedding the smut spores during the growth period in the field as well as during threshing. Infected plants are dwarfed; they seldom head out and are easily overlooked in a ripening field. smut spores with which the stripes are filled. In very early stages these stripes are lighter green than the rest of the leaf, but soon they develop a leaden and later a black color. They first appear in the upper leaves of diseased plants, before the plants begin to joint, and become very conspicuous
RMT1HEBX–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 124 PHYCOMYCETES. is very frequent on wild and cultivated Cruciferae throughout the whole world, and causes deformation of shoot, leaf, and flower. Fio. 34.—Ci/Atopus canditli'n. B, Conidiophores isolated from the cushion ; the conidia or spomiigia are united by intermediate cells. C, Sporangia breaking up to form swarm-spores. D, Swarm-sporos escaping. E, Swarm-spores in motile condition. F, Swarm
RM2AG3R98–. Report of the State Entomologist on injurious and other insects of the state of New York. PORIA RADICULOSA (Peck) Sacc. Plate 17 Poria semitincta (Peck) Sacc. 1 Specimens from the type collection, x i. a Growing on the surface of a dead fallen leaf.b Growing on rotten wood. 2 Specimen in New York State Museum herbarium, collected at South Bethlehem, N. Y. x i. 3 Microphotograph of vertical section through hymenium. x i6o. 4 Single hypha from the trama. 5 Hyphae from the subiculum and the growing margin. This type also represented in the trama. 6 Mature spores. 154 N. Y. State Botanists Repor
RMPG4E6W–. Diseases of economic plants . Plant diseases. 462 DISEASES OF ECONOMIC PLANTS in 1896 in Massachusetts. It was rapidly spread through- out this country by diseased stock, and is now known in nearly all localities where the chrysanthemum is culti- vated. The loss occasioned by the diminution in vigor of the plant and consequent imperfection of blooms is large. The sori, 2-3 mm. in di- ameter, which are diagnostic, first appear as small blisters covered by the epidermis. The rupture of this covering discloses a dark brown mass of spores. The sori are usu- ally very numerous upon the lower leaf
RMA5DXEM–Slender Break fern, Silver break, Silver Lace fern, Sword Brake (Pteris ensiformis 'Victoriae', Pteris ensiformis Victoriae)
RMMX3Y1B–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2MCTJRB–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
![. Fio. 329.—CepIuUeuros Mycoideo.. Section through part of an attacked leaf of Camellia. The epidermal layer has been ruptured, and haiistoria from the algal disc penetrate to the tissues. The dark-shaded portion is that killed by the alga. (xVfter Cunningham.) the older ones ; in addition, sporangial structures are also developed and give off biciliate swarm-spores. The discs form a kind of cuticle which becomes completely fused with that of the leave.';. 1 Karsten, AunaJ^ dujardin. hotan. tie Buitenzonj, Vol. x., 1801. -("unningham, Trans, of Linnean Soc. of London, 1880; H. M. Ward (id Stock Photo](https://c8.alamy.com/comp/MCK64J/fio-329cepiuueuros-mycoideo-section-through-part-of-an-attacked-leaf-of-camellia-the-epidermal-layer-has-been-ruptured-and-haiistoria-from-the-algal-disc-penetrate-to-the-tissues-the-dark-shaded-portion-is-that-killed-by-the-alga-xvfter-cunningham-the-older-ones-in-addition-sporangial-structures-are-also-developed-and-give-off-biciliate-swarm-spores-the-discs-form-a-kind-of-cuticle-which-becomes-completely-fused-with-that-of-the-leave-1-karsten-aunaj-dujardin-hotan-tie-buitenzonj-vol-x-1801-quotunningham-trans-of-linnean-soc-of-london-1880-h-m-ward-id-MCK64J.jpg ". Fio. 329.—CepIuUeuros Mycoideo.. Section through part of an attacked leaf of Camellia. The epidermal layer has been ruptured, and haiistoria from the algal disc penetrate to the tissues. The dark-shaded portion is that killed by the alga. (xVfter Cunningham.) the older ones ; in addition, sporangial structures are also developed and give off biciliate swarm-spores. The discs form a kind of cuticle which becomes completely fused with that of the leave.';. 1 Karsten, AunaJ^ dujardin. hotan. tie Buitenzonj, Vol. x., 1801. -("unningham, Trans, of Linnean Soc. of London, 1880; H. M. Ward (id Stock Photo")
RMMCK64J–. Fio. 329.—CepIuUeuros Mycoideo.. Section through part of an attacked leaf of Camellia. The epidermal layer has been ruptured, and haiistoria from the algal disc penetrate to the tissues. The dark-shaded portion is that killed by the alga. (xVfter Cunningham.) the older ones ; in addition, sporangial structures are also developed and give off biciliate swarm-spores. The discs form a kind of cuticle which becomes completely fused with that of the leave.';. 1 Karsten, AunaJ^ dujardin. hotan. tie Buitenzonj, Vol. x., 1801. -("unningham, Trans, of Linnean Soc. of London, 1880; H. M. Ward (id
RMT1H249–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 USTILAGO. 279 Ustilago maydis (D.C.) (Britain and U.S. xlmerica).- This smut of Zea Mais produces large and conspicuous deformations on leaves, leaf-sheaths, stems, roots, and all parts of the male and female flowers. These are whitish, gall-like swellings and blisters, containing a mass of gelatinous mycelium, from which spores are produced. The swellings may attain to the size of a fist, or even la
RM2AM8EAF–Annual report of the Regents . EXPLANATION OF PLATE 4 Eamulaeia graminicola Peck. Fig. 1. Upper part of a grass leaf marked with three fungous spota.Fig. 2. A cluster of four hyphae, two of them bearing spores, x 400.Fig. 3. Five spores x 400. Eamulaeia destruens Peck. Fig. 4. A leaflet with the upper half blackened by the fungus and showing two fungous spots.Fig. 5. Tufts of hyphsB, two filaments bearing spores, x 400.Fig. 6. Six spores x 400. Cercosporella Veratri Peck. Fig. 7. Upper part of a leaf with two fungous spots.Fig. 8. Three spores x 400. Aspergillus aviarius Peck. Fig. 9. Piece of
RMPG4ER4–. Diseases of economic plants . Plant diseases. 200 DISEASES OF ECONOMIC PLANTS Since the spores arc spread only when they are wet, handling or disturbing the vines in any way while the. Fig. 89. — Boan rust upon leaf and pods ; note the numerous sori upon both surfaces. After Heach. dew or rain is still upon them should be avoided. Seeds already bearing the fungus, i.e., spotted seeds, should never be planted, since they not only raise sick plants,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appea
RMMX3Y13–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2M3JJ4X–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCK674–. Fig. b6.Ustilago avenae. The Oat-smut on Avena sativa. (v. Tubeuf phot.) membrane of the ovary wall. The diseased ears emerge from their enclosing leaf-sheaths, and become exposed to wind and rain, under the effects of which the delicate membrane soon becomes ruptured and the spores are blown or washed away, till only the axes of the spikelet are left with a few ragged remains of the flower. As a rule every shoot of a plant and all the grains of an ear are attacked; if single grains do escape, they remain poorly developed. The spores (5-8^) have a smooth or slightly granular coat, and
![Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DILOPHOSPORA 427 DILOPHOSPORA (Desm.) Perithecia crowded, immersed in a crustaceous weft of hyphae or stroma; spores fusiform, septate, hyaline, furnished at each end with several simple or branched, delicate hairs. Wheat ear fungus {Dilophospora gramtnis, Desm.) some- times attacks ears of wheat and arrests the development of Fig. 132. — Cylindrosporiiirn padi. i, spots caused by fungus on a plum leaf; 2, section through a pustule of conidia of same; 3, conidia of Exosforium Stock Photo](https://c8.alamy.com/comp/T1J48F/diseases-of-cultivated-plants-and-diseases-of-cultivated-plants-and-trees-diseasesofcultiv00massuoft-year-1910-dilophospora-427-dilophospora-desm-perithecia-crowded-immersed-in-a-crustaceous-weft-of-hyphae-or-stroma-spores-fusiform-septate-hyaline-furnished-at-each-end-with-several-simple-or-branched-delicate-hairs-wheat-ear-fungus-dilophospora-gramtnis-desm-some-times-attacks-ears-of-wheat-and-arrests-the-development-of-fig-132-cylindrosporiiirn-padi-i-spots-caused-by-fungus-on-a-plum-leaf-2-section-through-a-pustule-of-conidia-of-same-3-conidia-of-exosforium-T1J48F.jpg "Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DILOPHOSPORA 427 DILOPHOSPORA (Desm.) Perithecia crowded, immersed in a crustaceous weft of hyphae or stroma; spores fusiform, septate, hyaline, furnished at each end with several simple or branched, delicate hairs. Wheat ear fungus {Dilophospora gramtnis, Desm.) some- times attacks ears of wheat and arrests the development of Fig. 132. — Cylindrosporiiirn padi. i, spots caused by fungus on a plum leaf; 2, section through a pustule of conidia of same; 3, conidia of Exosforium Stock Photo")
RMT1J48F–Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DILOPHOSPORA 427 DILOPHOSPORA (Desm.) Perithecia crowded, immersed in a crustaceous weft of hyphae or stroma; spores fusiform, septate, hyaline, furnished at each end with several simple or branched, delicate hairs. Wheat ear fungus {Dilophospora gramtnis, Desm.) some- times attacks ears of wheat and arrests the development of Fig. 132. — Cylindrosporiiirn padi. i, spots caused by fungus on a plum leaf; 2, section through a pustule of conidia of same; 3, conidia of Exosforium
RM2AM84F1–Annual report of the Regents . EXPLANATION OF PLATE 4 Eamulaeia graminicola Peck. Fig. 1. Upper part of a grass leaf marked with three fungous spota.Fig. 2. A cluster of four hyphae, two of them bearing spores, x 400.Fig. 3. Five spores x 400. Eamulaeia destruens Peck. Fig. 4. A leaflet with the upper half blackened by the fungus and showing two fungous spots.Fig. 5. Tufts of hyphsB, two filaments bearing spores, x 400.Fig. 6. Six spores x 400. Cercosporella Veratri Peck. Fig. 7. Upper part of a leaf with two fungous spots.Fig. 8. Three spores x 400. Aspergillus aviarius Peck. Fig. 9. Piece of
RMPG426P–. Botany for agricultural students . Botany. GAMETOPHYTE 431 spores as in the Interrupted Fern {Osmunda Claytonia) {Fig. S82). In some like the Sensitive Fern (Onoclea sensibilis), common along roadsides and in wet meadows, there are two distinctly different kinds of fronds, one of which is entirely devoted to bearing spores and the other entirely to vegetative work {Fig. 383). This separation of spore-bearing and vegetative tissues is adhered to more closely in some other Pteridophytes than in the True Ferns, and it is a feature. Fig. 382. — A portion of a leaf of the Interrupted Fern {Osmund
RMAMX4GN–Golden polypody, Golden serpent fern, Cabbage palm fern (Phlebodium aureum 'Mandaianum', Phlebodium aureum Mandaianum, Polypodi
RMMX3Y12–Small fungus on fallen twig near big tree in the Tsitsikamma National Park, garden route protection area, Western Cape, south africa
RF2MENRH4–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCK63B–. Fio. 215.—Cronnrtium rwlepindtuin. Section of a C'l/nanck urn leaf. The leaf-parenchyma is permeated with mycelium, and sori are formed on the lower epidermis. A, urcdo-sorus ; B, teleutospore-sorus, many spores of which have germinated and given off promycelia with sporidia. (v. Tubeuf del.) Brown spots may l)e found on the leaves of the Cywiarhum'^ during July, August, and September (Fig. 214). On examina- tion of the spots with a lens, the leaf-epidermis will be found ^ A very common plant in Europe though not indigenous to Britain. (Kdit.)
![Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 196 DISEASES OF CULTIVATED PLANTS the leaf-stalks. Its presence is indicated by the white patches bordered with orange-red. The fungus passes from the leaf- stalks into the root, penetrating to the heart, causing a rot. The conidial fruit first appears on the leaf-stalks, followed by the ascigerous form when the leaves are quite dead. Ascigerous form. Perithecia rounded, brown, asci oblong- clavate, 8-spored; spores hyaline, i-septate, upper cell ovate- rounded, largest, lower c Stock Photo](https://c8.alamy.com/comp/T1HJ1A/diseases-of-cultivated-plants-and-diseases-of-cultivated-plants-and-trees-diseasesofcultiv00massuoft-year-1910-196-diseases-of-cultivated-plants-the-leaf-stalks-its-presence-is-indicated-by-the-white-patches-bordered-with-orange-red-the-fungus-passes-from-the-leaf-stalks-into-the-root-penetrating-to-the-heart-causing-a-rot-the-conidial-fruit-first-appears-on-the-leaf-stalks-followed-by-the-ascigerous-form-when-the-leaves-are-quite-dead-ascigerous-form-perithecia-rounded-brown-asci-oblong-clavate-8-spored-spores-hyaline-i-septate-upper-cell-ovate-rounded-largest-lower-c-T1HJ1A.jpg "Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 196 DISEASES OF CULTIVATED PLANTS the leaf-stalks. Its presence is indicated by the white patches bordered with orange-red. The fungus passes from the leaf- stalks into the root, penetrating to the heart, causing a rot. The conidial fruit first appears on the leaf-stalks, followed by the ascigerous form when the leaves are quite dead. Ascigerous form. Perithecia rounded, brown, asci oblong- clavate, 8-spored; spores hyaline, i-septate, upper cell ovate- rounded, largest, lower c Stock Photo")
RMT1HJ1A–Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 196 DISEASES OF CULTIVATED PLANTS the leaf-stalks. Its presence is indicated by the white patches bordered with orange-red. The fungus passes from the leaf- stalks into the root, penetrating to the heart, causing a rot. The conidial fruit first appears on the leaf-stalks, followed by the ascigerous form when the leaves are quite dead. Ascigerous form. Perithecia rounded, brown, asci oblong- clavate, 8-spored; spores hyaline, i-septate, upper cell ovate- rounded, largest, lower c
RM2AXJDGX–Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . a h FIG. 62, CELEKY LEAF-SPOT.a, Spores germinating; 6, section of leaf showing fungus. Magnified. tion are represented. No winter spores have yet beendiscovered. It has been found, in some localities, that celerygrowing in the shade is seldom affected by this fungus.Hence it is recommended that, unless fungicides are tobe employed, as advised below, the celery bed be placedin situations shaded by trees; or that it be artificially10 146 FUIfGI AXD FUNGICIDE
RMPG41FA–. Essentials of botany. Botany; Botany. THE FUNGI 267 Examine first with m.p., and then with h.p. Note: (a) The forms of the cluster-cups at various stages of growth. Compare with the cup on an anemone leaf, shown in Fig. 181. (6) The structure of the cup, surrounded by a layer of mycelium, next to which comes theperidium, or wall of the cup. The latter is filled with chains of spores (cecidiospores). Draw the cup with its contents. (c) The size and shape of the mature f spores which separate from the ends of the chains. (d) The cavities, smaller than the cluster cups and on the opposite surfa
RM2AA0K5R–Leaf and mossy tree stump nature portrait in Surrey woodland, England, United Kingdom, Europe
RF2KFHYDP–or Rosehip disease what is making the bush drying. Plant disease of Wild Rose on dandelion Dog Rose field background. High quality photo
RMMCM06H–. Fig. 31. I, lixoascus deformans, sliowing asci in various stages of development burslinR through the cuticle of the leaf; 2, ascus of Exoanus pruni, showing stalk-cell at base of ascus, and eight spores; 3, ascus of Taphritia aiirca filled with secondary spores produced by budding of the ascospores ; 4, surface view of niycelium of Taphrina Sadcbcckii on leaf of Almes glutinosa ; 5, differentiation of fertile or ascogenous hyphae from vegetative hyphae of Tuphrina Sadebeckii. (Figs. 4 and 5 after Sadebcck.) All highly mag. upon. The asci at first contain eight spores, but in the majority of
RMT1HEC4–Diseases of wheat, oats, barley, Diseases of wheat, oats, barley, and rye diseasesofwheato48boew Year: 1960 130 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 48 formed in the summer and because it overwinters by means of its summer spores and as mycelium in the leaf tissue. Original infection of rye plants in the spring results in the production of open, orange-brown pustules on the leaves; within the pustules large numbers of summer spores are formed. Distribution of these spores results in further rye infection, from which new pustules arise after a period of 7 to 10 days. Continued repeti-
RM2AXJDR7–Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . 1300^3. a h FIG. 62, CELEKY LEAF-SPOT.a, Spores germinating; 6, section of leaf showing fungus. Magnified. tion are represented. No winter spores have yet beendiscovered. It has been found, in some localities, that celerygrowing in the shade is seldom affected by this fungus.Hence it is recommended that, unless fungicides are tobe employed, as advised below, the celery bed be placedin situations shaded by trees; or that it be artificially10 146 FUIfGI AXD F
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