NATURAL HISTORY SURVEY 87 



Lamellae at first white, then yellow-brown, ventricose, obtuse 

 behind, thin, crowded. 



Pileus 2.5 to 5 cm. broad; stem 2 to 4 mm. long, white, to- 

 mentose; spores 5.5 /*. 



Decaying logs and stumps, Glen Ellyn and Riverside. July 

 and August. Pilei up to 9 cm. broad, 6 cm. long. Spores glo- 

 bose, somewhat exceeding the dimensions given above, 6 to 7 p. 



Crepidotus mollis Schaeff. 



Pileus pallid then becoming hoary, gelatinous-fleshy, soft, 

 obovate or reniform, flaccid, nearly sessile, glabrous, often im- 

 bricated. 



Lamellae decurrent to the base, close, linear, whitish then 

 watery-cinnamon. 



Spores ferruginous, elliptic, 9 x 5 to 6 p. 



On rotten stumps, Glen Ellyn. August. Pileus white-to- 

 mentose toward the base, watery-white when moist, margin often 

 wavy, 2.5 to 6.5 cm. broad. Spores 8 x 5 /x. In moist weather 

 the pileus often becomes revolute with age, giving the plant the 

 appearance of a globe with lamellae projecting in all cirections. 



Crepidotus herbarum Pk. 



Pileus thin, resupinate, suborbicular, clothed with a white, 

 downy villosity, incurved on the margin when young, sometimes 

 becoming reflexed, sessile, dimidiate and less downy. 



Lamellae rather narrow, subdistant, radiating from a naked 

 lateral or eccentric point, white then subferruginous. 



Pileus 4 to 10 mm. broad; spores ellipsoid, 5 to 7.5 x 3.5 to 4 /*. 



On dead grasses, twigs, etc. Glen Ellyn. August. 

 Crepidotus fulvotomentosus Pk. 



Scattered or gregarious; pileus suborbicular, reniform or 

 dimidiate, sessile or attached by a short, white-villose tubercle 

 or rudimentary stem, hygrophanous, watery- brown and some- 

 times striatulate on the margin when moist, whitish, yellowish 

 or pale-ochraceous when dry, adorned with small, tawny hairy 

 or tomentose scales. 



Lamellae broad, subventricose, moderately close, rounded 

 behind, radiating from a lateral or eccentric white villose spot, 

 whitish, becoming brown-ferruginous. 



Pileus 1.5 to 5 cm. broad; spores ellipsoid, 7.5 to 10 x 5 to 6 p. 



On prostrate trunk of Acer, woods, Glen Ellyn. July. The 

 lamellae of our plant are not broad, and are scarcely subvent- 

 ricose. 



Crepidotus dorsalis Pk. 



Pileus fleshy, sessile, dimidiate or somewhat reniform, flat or 

 a little depressed behind, with a decurved slightly striate margin, 

 somewhat fibrillose-tomentose at the point of attachment, reddish- 

 yellow. 



