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 Add this item to the list   PERENNIPORIA MEDULLA-PANIS (Fr.) Donk.
Page number:471 
Description type:Non-original description 
Persoonia 5(1):76, 1967, - Polyporus medulla-panic Fr. Syst. Mycol. 1:280, 1821. - Poria medullaris S.F. Grey, Natural Arrangement of British Plants 1:639, 1821. - Polyporus unitus Pers. Mycol. Eur. 2:93, 1825.
FRUITBODY annual to perennial, usually effused but sometimes narrowly reflexed on vertical surfaces, forming irregular areas up to 30 cm in diameter, 1-30 mm thick, often several fruitbodies together which may later fuse. Consistency tough-corky, to hard when dry. PORE LAYER white, cream-,coloured to pale pinkish-buff, pale greyish brown with age, pores round to slightly angular, 5-7 per mm, dissepiments thick and entire, tubes in 1-8 layers, var. multistratosa, each 1-2 mm deep, margin adnate to loose, narrow, usually paler than the pore surface. CONTEXT cream to wood-coloured, 0.2-1 mm thick.
HYPHAL SYSTEM trimitic in the context and dissepiments, generative hyphae clamped, thin-walled and hyaline, with occasional branching, 3-4 µm in diameter, skeletal hyphae golden to pale brown, 3-4 µm wide, binding hyphae abundant to rare, with sparsely to abundant branching, tapering towards the ends, 1-2.5 µm in diameter, both skeletal and binding hyphae are weakly dextrinoid in Melzer's reagent. CYSTIDIA absent, but fusoid to ventricose cystidiols 15-20 x 6-8 µm, sometimes present in the hymenium. They are often difficult to find and are easiest observed in fresh specimens or when they have been dried fairly rapidly. SPORES ovoid to broadly ellipsoid, becoming truncate, hyaline to slightly yellowish, thin- to thick-walled, 4-7 x 3.5-6 µm, often collapsed, non-dextrinoid to variably dextrinoid in Melzer's reagent.
HABITAT. On dead deciduous wood, rarely on coniferous wood. DISTRIBUTION. Cosmopolitan, very common in East Africa.
REMARKS. The species is rather variable in surface colour in the tropics, often more pinkish-buff than is usual in Europe. In European collections the vegetative hyphae are non-dextrinoid, while they are variable dextrinoid in many tropical specimens, most easily seen when viewed in masses. The spores are in most collections non-dextrinoid, but a variable dextrinoid reaction occurs also, mostly rather weak even if it becomes stronger with warming and after some hours. The spores swell in KOH.
The variety multistratosa Pil. has been found a few times in East Africa. It is up to 30 mm thick, is distinctly stratified and is widely effused with a flat pore-surface.
Microscopically it is identical with the main variety.
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