zyxwvutsrqp zyxwvu zyxw The genus Navisporus (Polyporaceae) Leif Ryvarden zyxw zyxw zyxwvut zyxw zyxwvu zyxwvut zyx Ryvarden, L. 1983. The genus Navisporus (Polyporaceae). - Nord. J . Bot. 3: 41 1-413. Copenhagen. ISSN 0107-055X. The genus NuvisporuJ (Polyporaceae) has been restudied. Two species are included. The new combination Nnvisportrs .stt/cutus (Lloyd) Ryv. is proposed. L. Ryvnrtien, Hotitnicul In.vt., Unrv. o,f Oslo, P.O. Bur f 045, Blindern, N-Oslo 3, Norwuy. Introduction When the genus Navisporus Ryv. was described (Ryvarden & Johansen 1980: 443), ii technical error made the description of the type species far too short. Further studies among polypores have shown that another species should be included in the genus. Thus, it seemed desirable to give a complete treatment of the genus. The herbaria are abbreviated according to Holmgren & Keuken (1974). The slightly thick-walled, navicular to fusiform spores and the dextrinoid skeletal hyphae make Nuvisporus a distinct genus in the Polyporaceae. Key to species 1. Spores 12-15 pm long, context 1-5 cm thick, homogene- ous, punky, pale olivaceous to ochraceous brown, African species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . N. fkoccosus I . Spores 8-1 1 pm long, context duplex, 1-5 mm thick, coriaceous and pale cinnamon, South American species . . ....................................... 2.N. siilcaiiis Navisporus Ryv. Prel. polypore flora East Africa p. 443, 1980. Navisporus floccosus (Bres.) Ryv. Prel. polypore flora East Africa. p. 443, 1980. Fruitbody pileate, sessile, dimidiate to stipitate. Pileus smooth to finely tomentose in shades of brown. Pore surface white to pale cinnamon, pores small to medium, context wood-coloured to pale cinnamon, thick to thin, punky to coriaceous. Hyphal system dimitic, generative hyphae with clamps, skeletal hyphae thick-walled and dextrinoid, spores navicular to oblong fusiform, hyaline with slightly thickened walls, non-amyloid, and slightly dextrinoid to non-dextrinoid. On deciduous wood. Tropical Africa and America. - Type species: Navisporus ~7occosus(Bres.) Ryv. Remarks. The genus is probably related to Psedopiptoporus Ryv. which, however, has a distinct trimitic hyphal system with binding hyphae and amyloid skeletal hyphae, gloeopleurous hyphae and thin-walled, small spores. - Tranieres floccma Bres. Ann. Roy. Inst. Bot. Roma 6 : 179, 1896, nom. nov. for Fon7es inrrostuppeits Henn. Engl. Bot. Jahrb. 14: 343, 1892, non Fornes inrrosficppeus (Berk. & Cooke) Sacc. Syll. Fung. 6 : 1 X. 1888. - Po!,p,orus rnollicarnosics Lloyd. Lloyd mycol. Writ. 4, letter 60: 11, 1915. Fruitbody annual, sessile, dimidiate to stipitate, up to 35 crn diam and up to 7 cm thick at the base, coriaceous and punky of consistence. Pileus smooth to slightly scrupose at the base, glabrous and with age with a papery thin cuticle, ochraceous to pale brown, azonate to slightly sulcate and undulating. Margin rounded and lightcoloured, said to be slightly violet when fresh. Stipe when present, up to 8 cm long and wide, pale brown, glabrous. Pore surface pale brown to buff, pores thinwalled, round to angular, 2-3 per rnm, tubes pale brown to straw-coloured, up to 15 mm long. Context floccose, punky o r cottony, ochraceous to pale olivaceous to- 0 NORDIC JOLIRNAI. OF f301 ANY NORD J BOT 3 41 1 4 1 3 . MYCOL 027 Nord J . Bot. 3 (3) I Y X 3 41 1 zy zyxwv zyxwv zyxwv zyxwv zyx zy Johansen (1980). This was due to a misinterpretation of the type of Lloyd’s species. The latter came from Australia and represents a taxon which is very close to, if not conspecific with, Polyporus squamosus Fr. Representative specimens. Kenya: Mombasa (no further information, E). - Central Africa; ProbabIy Tanzania: leg. S. Schweinfurth (type of T. floccosa Bres., S). - South Africa: Pretoria, leg. 1. B. Pole Evans, Lloyd coll. 54304 (BPI). a Navisporus sulcatus (Lloyd) Ryv. comb. nov. 10 pm Fig. 1. Navisporus, spores of a) N. floccosus, b) N. sulcatus. From the lectotypes. wards the base, homogeneous. Hyphal system dimitic, generative hyphae with clamps, 2.5-4 pm wide. Skeletal hyphae dominating in the fruitbody, straight to sinuous, unbranched, strongly dextrinoid, in the context 3-6 pm wide and with a wide lumen, those of the trama more thick-walled to almost solid and less than 5 pm diam. Cystidia not seen. Spores subcylindrical, fusiform to navicular, 12-15 X 5-6 pm, thick-walled, smooth and slightly dextrinoid when mature. - Fig. la. Habit. On deciduous wood. Distribution: Somalia, Tanzania, Kenya and South Africa. Remarks. The species should be easy to recognize because of the large punky fruitbody in tan to pale brown colours. Microscopically the strongly dextrinoid skeletal hyphae and the navicular, somewhat thick-walled and weakly dextrinoid spores should be diagnostic. Pseudopiptoporus devians (Bres.) Ryv., which is macroscopically similar, has binding hyphae, amyloid skeletal hyphae and thin-walled ellipsoid spores, much smaller than those of N . floccosus. Lowe (1958: 147) indicated Polyporus farinosus Lloyd as a synonym. However, Lloyd did not give a formal description of P . farinosus, he only mentioned the name as a manuscript name from Rick (Lloyd 1915: 337), apparently not being aware that Rick published the name already in 1907 (Rick 1907: 85). Furthermore, Rick’s name is invalid as it is preoccupied by P . farinosus Bref. 1889, and Rick’s species was renamed Polyporus rickianus Sacc. & Trav. in Saccardo 19 11: 49 1. In Lloyd’s herbarium there is a small sample, presumably from the type of P. farinosus Rick. as it is named in Rick’s handwriting as already noted by Stevenson & Cash (1936: 104). This collection represents, according to my opinion, Polyporus ectypus Berk. & Curt. 1872, a species which is not related to N . floccosus and which will be treated in a later paper. Polyporus maculatissimus Lloyd was erroneously indicated to be a synonym of N . floccosus by Ryvarden & 412 Basionym: Trametes sulcata Lloyd, Lloyd Mycol. Writ. 7: 1146, 1922. - Fomes reviviscens Lloyd in Rick, Broteria Ser. B ~ 21: ~ 7,. 1924, Fruitbody annual, effused, reflexed to sessile and broadly attached. Pileus up to 3 cm wide and long, up to 4 mm thick at the base, cinnamon brown in distinct sulcate zones, ochraceous at the margin in young specimens, finely velutinate to tomentose. Pore layer horizontal to decurrent, wood-coloured to pale ochraceous when young, pale cinnamon in old specimens, thinwalled, subangular, 2-3 per mm, tubes concolorous, up to 6 mm deep, trama slightly darker than the inside of the tubes. Context distinctly duplex, the lower part pale cinnamon and dense, separated from the upper part by a thin, dense and black zone, most easily seen close to the base. Even if the black zone is weakly developed, the difference between the upper and lower layer is easily observed in section, upper layer softer and dark cinnamon, up to 2 mm thick. Hyphal system dimitic, generative hyphae with clamps, 2-4 pm wide, difficult to find in dry specimens, skeletal hyphae thick-walled, 2 - 4 pm wide in the trama, 2 to 6 pm wide in context, dextrinoid, pale yellow in the trama, golden yellow in the context (in KOH). Cystidia not seen. Spores oblong ellipsoid to fusiform or navicular, 8-1 1 X 5-6 pm, when mature pale yellowish and with slightly thickened walls, non-dextrinoid. - Fig. 1b. Habitat. On deciduous wood. Distribution. Known only from Brazil. Remarks. The species should be easy to recognize because of the cinnamon, sulcate pileus, the duplex structure of the context, fusiform spores and dextrinoid skeletal hyphae. The spores and the fruitbody are smaller than those of N. floccosus which further has a much more punky, thicker and pale olivaceous context. Representative specimens. Brazil: Coll. Rick (type of T. sulcata, BPI); Coll. Rick (type of F. reviviscen.s, BPI); Amazonia, Roraima, Auaris, 31 Jul 1974, leg. G. T. Prance et al. 21609 (NY). Nord. J. Bot. 3 (3) 19x3 zyxwvutsrqp zyxwvutsrqp zyxwvutsrq zyxwvutsrq References Rick, J. 1907. Contributio ad monographiam Agariacearum et Polyporacearum Brasiliensium. - Broteria, Ser. Bot. 6: 65-92. Ryvarden, L. & Johansen, I. 1980. A preliminary polypore flora of East Africa. - Fungiflora, Oslo. Saccardo, P. A. 1911. Sylloge fungorum 20. - Padua. Stevenson, J. A. & Cash, E. K. 1936. The new fungus names proposed by C. G. Lloyd. - Bull. Lloyd Lib. Mus. 35: 1-209. zyxwvutsrqpon Holmgren, P. K. & Keuken, W. 1974. Index Herbariorum. Part. 1. The Herbaria of the world. - Reg. Veget. 92: 1-397. Lowe, J. L. 1958. Studies in the genus Fomes 1. Some synonyms. - Papers Mich. Acad. Sci. Arts Letters 43: 147-1 49. Lloyd, C. G. 1915. Synopsis of the section Apus of the genus Polyporus. - Lloyd Mycol. Writ. 4: 289-392. Nord. J . Bol. 3 (3) 19x3 413