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 Add this item to the list   PERENNIPORIA Murr. Mycologia 34:595 1942.
Page number:463 
Description type:Non-original description 
Description:PERENNIPORIA Murr. Mycologia 34:595, 1942.
Fruitbodies mostly perennial, rarely annual, resupinate, effused-reflexed to pileate, dimidiate to broadly attached, consistency woody-hard to brittle, pileus slightly velvety to smooth, ochraceous, brown to blackish with age, pore surface white, cream to dirty straw-coloured, pores small, isodiametric, tubes usually stratified, context thin, white to light ochraceous, hyphal system di-trimitic, generative hyphae thin-walled, hyaline, smooth and clamped, often difficult to observe, vegetative hyphae dominating in the fruitbody and often difficult to assign to one of the two groups of vegetative hyphae, solid to thick-walled, unbranched to moderately branched, non-dextrinoid to variably dextrinoid, cystidia absent or present, spores thick-walled, globose, oblong ellipsoid to pepshaped, often truncate, hyaline to yellow, variably dextrinoid, often with spores reacting variably within the same fruitbody. On dead deciduous and coniferous wood. Cosmopolitan genus.
Type species: Perenniporia medulla-panis (Fr.) Donk.
REMARKS. The genus is based primarily on the thickwalled, mostly truncate spores with a variable dextrinoid reaction and vegetative hyphae with the same reaction. The fruitbodies are light-coloured except for the pileus in a few species because the vegetative hyphae are hyaline. Both Loweporus and Pyrofomes are related and separated mainly by their coloured skeletal hyphae making the fruitbodies browngrey and reddish respectively. The dextrinoid reaction of the spores and the hyphae is variable from specimen to specimen and even within the same specimen.
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