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Page number:266 
Description type:Non-original description 
Description:Fomitella supina (Swartz: Fr.) Murr. Fig. 125.
Bull. Torrey Bot. Club 32:365, 1905. - Boletus supinus Swartz, Flora Ind. Occid. III, p. 1926, 1806. - Polyporus supinus Swartz: Fr., Syst. Mycol. 1:376, 1821.
Basidiocarps annual or perennial, sessile or effused-reflexed, single or imbricate, dimidiate, or occasionally circular on the top of logs, applanate, up to 15 x 7 x 4 cm, upper surface highly variable, pale ochraceous, minutely tomentose, azonate, smooth in early stages of development, often with a basal portion or most of pilear surface becoming darker and eventually reddish-brown to black and crustose or laccate, in other specimens weathering to almost white and becoming rough, frequently greenish from algae in older specimens, pore surface purplish brown to cinerous or smoky, the pores circular, 5-7 per mm, with thick, entire dissepiments, context ochraceous to pale brown, zonate, firm-fibrous, up to 2 cm thick, in laccate specimens with a hard, horny dark layer at the surface, in some perennial specimens new tube layers are separated from older ones by a layer of context tissue, tube layers becoming indistinctly stratified with older tubes filled with mycelium, purplish tan on younger specimens, distinct from context, single layers up to 5 mm thick.
Hyphal system trimitic, contextual generative hyphae thin-walled, with clamps, rarely branched, hyaline, 2.5-3.5 µm in diam, difficult to find in mature specimens, contextual skeletal hyphae thick-walled, nonseptate, hyaline, rarely branched, 4-9 µm in diam, contextual binding hyphae thick-walled, nonseptate, much branched, hyaline, 1.5-4 µm in diam, tramal hyphae similar but skeletal hyphae more narrow, up to 5 µm in diam.
Cystidiaor other sterile hymenial elements lacking.
Basidia clavate, 4-sterigmate, 15-17 x 6-8 µm, with a basal clamp. Basidiospores cylindric, hyaline, smooth, negative in Melzer's reagent, 7-9 x 3-3.5 urn.
Type of rot. - White rot of dead hardwoods.
Cultural characteristics. - Unknown.
Sexuality. - Heterothallic and tetrapolar (Nobles et al. 1957).
Substrata. - Dead wood of numerous genera of hardwoods, reported by Davidson et al. (1942) as rarely causing decay in heartwood of living oak.
Distribution. Southeastern U.S., especially in bottomland hardwood forests of the Gulf Coast region.
Remarks. Fomitella supina is morphologically like species of Fomitopsis but is a white rot fungus. It is also similar to Earliella scabrosa, see remarks under that species.
Taxon name: