Search on : Taxa descriptions


 Add this item to the list   Amylosporomyces Rattan
Page number:15 
Remarks (internal):The principal features, as enumerated by Rattan, are the membranous and thin basidiomes, absence of both gloeocystidia and cystidia, presence of rhizomorphs, and the small, echinulate, amyloid basidiospores. Initially two species were included: A. echinosporus, which was proposed as a new species, and Peniophora humifaciens Burt which was transferred to Amylosporomyces. Subsequently, Hjortstam and Ryvarden (1988) transferred Gloeocystidiellum subasperisporum to Amylosporomyces.
Current status Peniophora humifaciens has skeletal hyphae and cystidia, and was transferred to Scytinostromella by Freeman and Petersen (1979). The inclusion of G. subasperisporum which has, according to Hjortstam and Ryvarden, similar basidia, spores and density of the subicular tissue to A. echinosporus enlarges the circumscription of the genus to include species with gloeocystidia. This species lacks rhizomorphs, thus limiting their value as a generic character. Thus the principal features of Amylosporomyces seem to be 1) small, ornamented, amyloid basidiospores, 2) suburniform basidia, 3) clamp connections, 4) one species has gloeocystidia, and 5) thin, delicate basidiomes.
Amylosporomyces includes two species: A. echinosporus and A. subasperisporus. Only the latter has been found in North America.
Description type:Non-original description 
Description:Amylosporomyces Rattan
Biblioth. Mycol. 60: 244, 1977.
Type species Amylosporomyces echinosporus Rattan
Basidiomes effuse, typically several cm long and broad, thin to 0.2 mm thick, membranous, white, pallid to pale yellow, lignicolous or corticolous. Hymenial surface furfuraceous, smooth, but conforming to the topography of the substrate. Subiculum very thin, indistinct. Hyphal system monomitic. Generative hyphae with clamp connections, narrow 1.5-2.5 µm diam, the walls hyaline, thin, nonamyloid, acyanophilous. Gloeocystidia present in one species, cylindric, obclavate, clavate, small, about 15-40 x 4-6 µm; the walls hyaline, thin; the contents oily to granular and pale yellow in KOH, sulfo-positive or sulfo-negative. Basidia suburniform, about 15 x 5 µm with four sterigmata. Basidiospores reniform, small, about 3-5 x 2-3 µm, the walls hyaline, thin, amyloid, acyanophilous, verruculose, with a minute apiculus.
Taxon name: