Search on : Taxa descriptions

 


   
Literature:
 
Page number:504 
Description type:Non-original description 
Description:POLYPORUS SQUAMOSUS Fr. Syst. Mycol. p. 343, 1821.
FRUITBODY annual, growing solitary or in groups, pileate to laterally or more rarely centrally stipitate, 5-30(60) cm in diameter and 0.5-5 cm thick. consistency brittle to hard when dry, fleshy when fresh. PILEUS circular, reniform or flabelliform, upper surface cream-coloured to ochraceous, brown when dry, covered with concentrical rows of more or less adhering dark brown to bay scales, in centre or near the stipe somewhat concave, margin thin, somewhat undulate and depressed. STIPE lateral, less frequently eccentric and central in earthgrown specimens, 3-10 x 2-6 cm, often very short to almost missing, near the pileus covered with pores, at the bottom covered with a brownish to black felt. PORE LAYER decurrent on the stipe, pore surface whitish, soon cream to straw-coloured, darker when dry, pores irregular and angular, very large, 0.5-2(3) mm in diameter, dissepiments thin and entire, tubes 2-10 mm thick, concolorous with pore surface. CONTEXT succulent-fleshy and whitish to strawcoloured when fresh, darker and friable when dry, 1-4 cm thick, usually paler then the pore surface.
HYPHAL SYSTEM dimitic, generative hyphae hyaline and thin-walled, 2-4 µm wide, with large clamps, binding hyphae hyaline to pale yellow, thick-walled to solid, 1-5 µm wide, moderately to heavily branched. Hyphae in the hymenium are filled with numerous small to large oil-drops giving a grainy appearance. Context is dominated by moderately branched binding hyphae, thick-walled and highly refractive, up to 10 µm wide in KOH. SPORES oblong-ellipsoid, somewhat curved, smooth and thin-walled 10-14(16) x 4-5(6) µm, nonamyloid, often with several oil-drops.
HABITAT. Parasite and saprophytic on deciduous trees, very rarely on coniferous trees. DISTRIBUTION. A rare species in Africa and specimens have been examined from Ethiopia and Tanzania. Cosmopolitan species.
REMARKS. The shape of the fruitbody is rather variable, but the light-coloured pileus with dark brown adpressed scales or squamules are distinctive besides the blackish base of the stipe, which, however can be almost lacking.
 
Taxon name: