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 Add this item to the list   FOMITOPSIS SUPINA (Fr.) Ryv.
   
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Page number:342 
Description type:Non-original description 
Description:FOMITOPSIS SUPINA (Fr.) Ryv.
Bull. Jard. Hot. Nat. Belg. 47:102, 1978. - Polyporus supinus Fr. Syst. mycol. 1:376, 1821 (K!). - Polyporus valenzuelianus Mont. Ann. Sci. nat. ser. 2, vol 17:127 184 (PC!). - Polyporus hemileucus Berk. & Curt. Linn. Soc. Bot. J. 10:312, 1868 (K!).'
FRUITBODY perennial, pileate, solitary, more rarely fused to more compound fruitbodies, semicircular, broadly sessile to dimidiate with a tapering base, when young applanate and rather thin, with age becoming triquetrous in section, up to 15 cm long and 10 cm wide, usually 0.5-2 cm thick at the base in applanate specimens, in large triquetrous specimens up to 8 cm thick at the base, rigid to corky when fresh, woody hard when dry. PILEUS first adpressed velutinate and ochraceous to pale buff, soon becoming glabrous and leathery brown to dirty brown and then from the base developing a cuticle, first dull brownish to reddish-brown, then becoming dull reddish and finally deep bay or reddish-black, in old and large specimens all these stages can be observed from the margin to the base, often in distinct sulcate zones reflecting distinct stages of growth, in older parts of pileus with a distinct crust which is thinning out towards the margin.
In some large Afrrican specimens a secondary growth has developed at the base, ochraceous to greyish in color, when sectioned, the original reddish bay cuticle can be observed as a black line below this secondary outgrowth or context, margin entire rounded to rather sharp. PORE SURFACE ochraceous, wood coloured, pale leathery-brown, isabelline or pale umber with age, pores round and entire, 5-7 per mm, in old and sterile specimens even smaller as the pores seem to be partly closed in dry periods, tubes more or less concolorous with pore surface, in young and applanate specimens non-stratified or with two-three layers, each up to 4 mm deep, in large triquetrous specimens 7 layers have been counted. CONTEXT first ochraceous becoming golden-brown and finally almost umber brown, fibrous and dense, often zonate, reflecting stages of age, mostly homogenous, in some specimens and lighter in colour towards the pileus.
HYPHAL SYSTEM trimitic, generative hyphae clamped, hyaline and thin- to slightly thick-walled, 2-3 µm in diameter, slightly wider in the context, often partly collapsed, skeletal hyphae abundant in the whole fruitbody, golden to pale brown, thick-walled with a distinct lumen, 58 µm in diameter, sometimes with secondary simple septa, binding hyphae light yellow, thick-walled, about 3-4 µm wide, slightly irregularly branched, not abundant. CYSTIDIA none. SPORES only observed in a few collections, cylindrical 6,5-9 x 2.4-3.5 µm, hyaline, thin-walled and IKI-.
HABITAT. On angiosperms of all kinds. DISTRIBUTION. Probably widespread in tropical and subtropical America from Southern United States through the West-Indies and down into South America. In Africa observed in Cameroons, Ethiopia, Kenya, Rwanda, but seems to be rather rare in Africa.
REMARKS. The species may be recognized by its perennial and woody hard fruitbodies becoming reddish to bay and laccate from the base, and its ochraceous to brownish colours on pore surface and context. The skeletal hyphae are almost hyaline, becoming tinted with age and we therefore prefer to place the species in Fomitopsis rather than in Fomes which has generally the same type of hyphal system and spores, but where the skeletal hyphae are distinctly coloured and thus the context is brown.
Coriolopsis is also a genus which could be considered, but with its distinctly perennial fruitbodies with stratified tubes and a laccate pileus, P. supinus seems better placed in Fomitopsis. However, it is clearly acknowledged that young specimens of this species are rather similar to specimens of C. sanguinaria which also develop a reddish cuticle from the base in some specimens.
 
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