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 Add this item to the list   RIGIDOPORUS MICROPORUS (Fr.) Overeem.
Page number:545 
Description type:Non-original description 
Description:RIGIDOPORUS MICROPORUS (Fr.) Overeem.
Icon. Fung. Malayensum 5:1, 1924. - Polyporus microporus Fr. Syst. Mycol. 1:376, 1821 (K:). - Polyporus lignosus K1. Linnaea 8:485, 1833 auct., type not found.
Literature: Pegler, D.N. & Waterston, J.M. 1968: CMI Pat. Fungi & Bact. no 200.
FRUITBODY annual, more seldom perennial, occasionally resupinate but mostly pileate, sessile or broadly attached, often imbricate or growing together in clusters, consistency brittle and hard when dry. PILEUS dimidiate to flabelliform, up to 22 cm long and 10 cm from margin to attachment and 0.2-1.5 cm thick, upper surface first orange-reddish-brown and slightly velutinate, later glabrous and fading to woodcolour, concentrically zonate-sulcate, dull to slightly shining, margin thin and often decurrent. PORE SURFACE first bright orange to reddish-brown, fading to ochraceous, pale brown or grey, pores round to angular 6-9 per mm, dissepiments very thin, tubes single-layered but sometimes stratified and up to 1 cm long, tubes reddish-brown near the pore mouth at least. CONTEXT white, cream to wood-coloured, radially fibrous, up to 1 cm thick.
HYPHAL SYSTEM monomitic, generative hyphae in the pore layer thin to thick-walled, hyaline to yellowish with simple septa, 3.5-5 µm in diameter, sparsely branched, in the context of the same kind but slightly more thin-walled and up to 8 µm wide. CYSTIDIA none, but bulbous to slender cystidiols present in the hymenium, 20-25 x 10-12 µm, often difficult to find in non-sporulating specimens. SPORES subglobose, hyaline, smooth and thin-walled 3.5-4.5 x 3.5-4 µm, non-amyloid.
HABITAT. Parasitic on deciduous trees. DISTRIBUTION. In tropical and sub-tropical parts of Asia, Africa and America.
REMARKS. R. microporus is distinguished from R. lineatus by the absence of cystidia.
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