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Page number:60 
Remarks (public):The concept is the one recognized in Europe and well-illustrated by Lundell & Nannfeldt Fungi Exs. Suec. Nos. 155, 1012 a & b. µm; collection at Kew, identified by Fries, is mixed and neither of the two species represented (probably P. luteoalba and P. vaillantii) agree with the concept presented here.
Poria myceliosa is very similar but differs in having somewhat larger spores that turn blue in IKI. P. candidissima is also very similar but is easily distinguished by its echinulate spores. P. consobrina Bres. may be the same species; its distinguishing characters, according to the original description, are its large pores and short tubes. Its characters, as described and in material studied, could come within the concept adopted here, but they seem to conform better with those of P. hypolateritia.
The specific name mollusca (misspelled mollusca) was first used by Bresadola for sterile specimens. Later (Ann. Mycol. 1:80. 1903) he gave measurements of the spores. As the shape and iodine reaction of the spores are critical for the separation of this species from P. myceliosa, the specimen chosen for lectotype is the one that agrees most closely with the published account of the microscopic characters. It is Eichler No. 38, in the Bresadola material at the Riksmuseum (S; BPI; SYRF).
Description type:Non-original description 
Description:Poria mollusca (Pers. ex Fries Cooke Fig. 36 Grevillea 14:109. 1886 in the sense of Bresadola, Accad. Rover. Agiati Atti 3(3):86. 1897 (lectotype-S). Polyporus molluscus Pers. ex Fries, Syst. Myc. 1:384. 1821. Boletus molluscus Pers., Synop. Meth. Fung., p. 547. 1801.
Annual, effused, up to 2 mm thick, separable, without distinctive taste; margin white, cottony or more often radially fimbriate, narrow to wide, with poorly to well-developed white rhizomorphic strands which sometimes are well-formed in the rotted wood; pore surface white, on drying cream in the older pore areas, dull, the tubes fragile when dry, up to 2 mm long, pores round to angular, sinuous, or daedaloid, variable in size and 2-6 per mm, edges becoming thin and fimbriate; context white, very soft and fibrous-fragile, thin, continuing without change into the trama which is frequently wide at the juncture, narrowing above and the dissepiments somewhat triangular in section.
Tissue unchanged in KOH; hyphal system monomitic, the context of generative hyphae which are moderately branched, thin-walled, with abundant clamp connections, 2-4 µm; in diameter; trama continuous with the context, the hyphae similar to those of the context except 2-2.5 µm; in diameter; hymenium yellowish-granular in KOH, 12-19 µm; thick; cystidia none; basidia clavate, 10-14 x 4-5 µm; spores hyaline, smooth, IKI -, broadly ellipsoid to oval, apiculate, 2.5-3.5 x 2-2.5 µm.
On well-decayed gymnosperms and angiosperms in Ont., N. Y., Idaho, Mont., Colo., Wash., and in Europe; associated rot unknown.
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