Search on : Taxa descriptions


 Add this item to the list   TYROMYCES CAESIUS (Fr.) Murr.
Page number:600 
Description type:Non-original description 
Description:TYROMYCES CAESIUS (Fr.) Murr.
North Am. Fl. 9:34, 1907. - Polyporus caesius Fr. Syst. Mycol. 1:360, 1821.
Special literature: Jahn H. in Westf. Pilzbr. 9:94-96, 1973. David, A. in Bull. Soc. Linn. Lyon spec. vol. 119-126, 1974.
FRUITBODY annual, subresupinate to pileate, often with a decurrent resupinate pore layer and a small deflexed pileus along the upper edge, mostly small, when pileate mostly 1-4 cm wide and up to 3-6 cm long, often smaller, single or imbricate or laterally fused with adjacent fruitbodies, variable in thickness, 2-10 mm thick, soft when fresh, hard to brittle when dry, not bitter. PILEUS velutinate to finely pubescent, becoming smooth by age, azonate, whitish to greyish blue, darkens when touched in a fresh condition, margin sharp and undulating. PORE SURFACE white to pale greyish or ashy bluish in parts, often darker when dried or touched in fresh condition, pores angular and finely dentate in the pore-mouths, about 4 per mm, tubes concolorous with the pore surface and distinctly greyish when contrasted with the lower white part of the context, up to 8 mm deep in large specimens. CONTEXT soft when fresh, harder when dry, white in the lower part, slightly greyish towards the pileus and in some larger specimens with a distinct zone separating the lower white part and an upper looser and coloured part, but this line or zone has not been observed in all specimens examined.
HYPHAL SYSTEM monomitic, generative hyphae with clamps and weakly amyloid, some basidia also with amyloid content, hyphae in the trama and subhymenium 2,5-5 µm wide, in the context and upper tomentum up to 7 µm wide. SPORES cylindrical and slightly bent, smoth, hyaline and strongly to weakly amyloid, 4-5 x 0.7-1 µm.
HABITAT. Mostly on gymnosperms, but also on angiosperms. We have seen only one collection from Africa, Kenya, Eastern Prov., Meru distri. Mt. Kenya N.E. slope, Chigora track (R. 9595, 0), unknown host. DISTRIBUTION. Cosmopolitan species.
REMARKS. The species is easy to recognize by its bluish colour when fresh, often fading to greyish when dry. The tubes are greyish, contrasting the white context. The spores are very weakly amyloid.
Taxon name: