Pleurotus. 105 



firm, cupulate, resupinate then reflexed, slightly striate, subpruinose, 

 base downy; gills broad, paler; sp. glob. 4 5. 



Differs from P. tremulus in absence of distinct s. 



[Mustialensis, Karst. P. resupinate, subgelatinous within, 

 sessile or with an exceedingly short lateral stem, black, white- 

 tomentose ; g. distant, narrow, paler ; sp. 6 8 x 4. 



Differs from P. applicatus in black p. with white down, and 

 dark g. 



* * * Pileus membranaceous, not viscid. 



Hobsoni, B. P. 4 7 mm. reniform or semicircular, horizontal, 

 pale grey, downy ; g. radiating, pallid ; sp. . 



Differs from P. applicatus in being plane. 



striatulus, Fr. P. 3 4 mm. very thin, pale grey, slightly cup- 

 shaped, striate, glabrous ; g. few, distant. 



[canus, Q. P. thin, dimidiate, reniform, edge mostly lobed, 

 whitish, downy, striate ; g. very distant, adnate, white, edge fimbriate; 

 s. rudimentary ; sp. 7 9 x 5. 



[arenarius, Lasch. Hoary-pallid, subsulcate, slightly tomentose ; 

 g. distant, thick, broad ; s. absent or very short, white-floccose. 



Allied to P. striatulus. 



[perpusillus, Fr. White. P. very thin, resup. then reflexed, 

 even, glabrous ; g. few, broad. 



[subplicatus, Karst. P. very thin, resup. orbicular, usually 

 entire, almost plane, striato-plicate, rather silky, white, fixed by a 

 white downy base ; g. radiating from an excentric point, broad, 

 whitish ; sp. 6 7 x 4 5. 



var. cinereus, Karst. Entirely pale grey or glaucous. 



hypnophilus, B. P. 3 6 mm. very thin, flat, white, rather 

 reniform, nearly smooth ; g. radiating, distant, simple ; sp. 5 x 3. 



Resembling Claudopus variabilis, but gills and spores white. 



chioneus, Pers. Snow white. P. 2 3 mm. very thin, subresu- 

 pinate, downy; s. short, downy, evanescent ; g. rather broad ; sp. 

 10 long. 



P. septicus is larger ; s. more distinct ; p. thicker. 



Differs from P. hypnophilus in downy pileus. 



[craterellus, Dur. and Lev. Cupulate, white, even, downy, edge 

 entire ; sp. 6 long. 



| pudens. Q. P. downy, hygr. coriaceous, cup-shaped, g. radiating, 

 thin, wavy, white tinged lilac ; s. central, short. 



