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Literature:
 
Page number:20 
Description type:Non-original description 
Description:Poria similis Bres. Fig. 4 Mycologia 17:76. 1925 (lectotype-BPI; SYRF).
Annual, becoming widely effused, up to 4 mm thick, probably separable, odor and taste not distinctive; margin white to cream, matted, rather narrow; pore surface white, drying cream to pale yellowish brown, slightly glancing, the tubes when dry papery to papery-fragile, up to 3 mm long, pores angular, 3-4 (-5) per mm, edges thin, entire; context when dry brownish above, paler below, soft-fibrous, thin, continuing without change into the trama.
Tissue not changing in KOH; hyphal system monomitic, the context of generative hyphae which are rarely branched, rather thin-walled, frequently simple-septate, 2-4 µm in diameter; trama continuous with the context and the hyphae similar except more slender, 2-2.5 µm; in diameter; hymenium 10-14 µm thick; cystidia abundant, coarsely incrusted in the upper half to more or less throughout, cylindrical to somewhat clavate, 15-40 x 7-12 µm; basidia clavate, 10-14 x 5-7 µm; spores hyaline, smooth, IKI -, broadly ellipsoid to broadly oval, 2.5-4 (-5) x 2.5-3.5 µm.
On angiosperms, especially Po pulus, in the northern half of the United States, and in Manitoba; associated with a white rot.
Poria corticola is very similar but has larger spores, 6-8 x 3-5 µm; and smaller, less completely incrusted cystidia. Resupinate Polyporus cuneatus is somewhat similar but differs in occurring on gymnosperms, having pores 2-3 per mm, and strictly capitate-incrusted cystidia 4-5 µm; in diameter. Resupinate first year's growth of Fomes connatus (Weinm.) Gill. is also very similar but has cystidia more decidedly capitate, and it is distinctly tougher.
There are no specimens of the original material at Stockholm, and the packet which agrees with the original description at BPI is unnumbered. It is very probably Weir 11565, and this packet is selected as lectotype.
 
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