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Page number:158 
Description type:Non-original description 
Description:Poria demetrionis (Murr.) Sacc. & Trott. Fig. 146 Syll. Fung. 21:330. 1912. Fomitiporella demetrionis Murr., North
Amer. Flora 9:12. 1907 (NY; BPI; FH; SYRF).
Perennial (type of two layers), effused, up to 5 mm thick, probably separable, without taste; margin pale reddish brown, determinate, shortpubescent, rather narrow; pore surface pale reddish brown, dull, the tubes
firm, up to 2 mm long in each indistinct layer, pores round, 8-10 per mm, edges thick, entire; context reddish brown, rather firm, fibrous-fissile, up to 1 mm thick, continuing without change into the trama.
Tissue immediately darkening but without stain in KOH; hyphal system dimitic, the context almost entirely of skeletal hyphae which are rarely branched, thin- to rather thick-walled, infrequently simple-septate, 2-4 µm in diameter, generative hyphae in fragmentary condition and of uncertain characters; trama continuous with the context and of similar hyphae; hymenium about 7-8 µm thick; setae frequent, subulate, 14-25 x 4-7 basidia broadly clavate, 6-8 x 4.5-5 µm; spores hyaline, smooth, IKI -, broadly ellipsoid to oval, 4-4.5 (-5) x 2.5-3 µm.
On angiosperms in Missouri, not otherwise known with certainty; rot unknown.
Poria laevigata is very similar but seems to differ in having pores 6-8 per mm and the setae ventricose. P. cinchonensis and P. nicaraguensis also resemble it but differ in having pores 6-8 per mm and setae 20-35 µm long, and the latter as well in having smaller spores 3-4 x 2-2.5 µm. Resupinate Polyporus licnoides Mont., once considered the same (Lowe, Lloydia 21:111. 1958) seems to differ in having setae 30-40 µm long, according to Overholts (1953, p. 404).
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