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Page number:37 
Description type:Non-original description 
Description:Poria spissa (Schw.) Cooke Fig. 21 Grevillea 14:110. 1886. Polyporus spissus Schw. in Fries, Elench. Fung., µm. 111. 1828 (PH; BPI; K). P. cruentatus Mont., Ann., Sci. Nat. Bot. 4,1:129. 1854 (PC; BPI; K). P. crociporus Berk. & Curt. in Curtis, Geol. and Nat. Hist. Survey N. Car. Ill, µm. 100. 1867 (K; BPI). P. laetificus Peck, N. Y. State Mus. Ann. Rept. 38:91. 1885 (NYS; BPI). Annual, becoming widely effused, up to 3 mm thick, separable, without distinctive odor or taste; margin pale yellowish brown, matted-mycelioid, narrow to wide; pore surface brilliant orange, paling toward the margin, usually slowly turning dark red where bruised and to a dark brownish red on drying, dull, the tubes soft when fresh, rigid and brittle when dry, up to 3 mm long, pores round to angular, about 6-8 per mm, edges remaining rather thick, entire; context white to pale brownish, soft and spongy to rather firm, thin, with a sharply differentiated layer next the tubes and continued into them.
Tissue not markedly changed in KOH; hyphal system monomitic, the context in the part next the substratum composed of generative hyphae which are loosely and irregularly arranged, rarely branched, more or less incrusted with crystals which are reddish in KOH, thin-walled, frequently simple-septate, 3-4 µm in diameter, the hyphae in the context next the tubes (and continued into them) strongly coherent and very compactly arranged, appearing almost pseudoparenchymatous, thin-walled, with reddish material in the lumina, inconspicuously simple-septate, 1.5-2.5 µm. in diameter; hymenium 9-14 µm. thick; cystidia none; basidia clavate, 9-13 x 4-5 µm; spores hyaline, smooth, IKI -, allantoid, 4-5 x 1-1.5 µm..
On angiosperms and rarely gymnosperms, widely distributed in temperate Canada and the United States, in Cuba, in French and British Guiana, Ecuador, Tahiti, and New Zealand; associated with a white rot.
Fresh and dried specimens of Poria mutans can easily be confused with this species but can be separated by the larger pores, 4-6 per mm, nodoseseptate hyphae, and ellipsoid to ovoid spores 3-5 x 2.5-3.5 µm. P. taxicola is also very similar, but differs in being restricted to a gymnosperm substratum, in having a less colorful fresh pore surface, pores about 4 per mm, tramal tissue not at all pseudocellular in appearance, and usually somewhat wider spores.
P. mellita Bourdot, from France, is similar externally, but differs in having pores 3-4 per mm, the trama not pseudocellular, and its spores 5-7 x 1.5-2.5 µm.
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