46 THE CHICAGO ACADEMY OF SCIENCES 



Stem slender, firm, hollow, often curved, brown, a little paler 

 at the top, tawny-villous at the base. 



Pileus 8 to 25 mm. broad; stem 2.5 to 3.5 cm. long, scarcely 

 2 mm. thick. 



On rotten stumps, River Forest and Glen Ellyn. Densely 

 gregarious. Pileus often infundibuliform when old. Spores 

 somewhat ellipsoid, but varying in shape, about 6 x 3 /*. 



Omphalia stellata Fr. 



Pileus membranous, convex, umbilicate, glabrous, striate, 

 diaphanous, white. 



Lamellae broad, very distant, thin, decurrent, white. 



Stem filiform, fragile, equal, glabrous, white, radiate-floccose 

 at the base. 



Spores subglobose or broadly elliptical, 6 x 5 u. Pileus 4 to 8 

 mm. broad; stem 12 to 20 mm. long. 



In grassy places. River Forest. June. Harper. 



Omphalia rustica Fr. 



Pileus membranaceous, broadly umbilicate, otherwise convex, 

 striate and fuscous then gray when moist, when dry becoming- 

 even and whitish or brownish. 



Lamellae decurrent, thick, rather distant, gray, the edge 

 arcuate. 



Stem slender, stuffed, curt, equalor thickened upwards and 

 only where so thickened at length hollow, gray-brown. 



Spores somewhat ellipsoid, 7.5 to 10 x 4 to 5 /x. Pileus 12 

 cm. or less broad; stem 12 cm. or rarely more long, 1 mm. thick. 



In short grass in gravelly soil, open woods, Winfield. May, 

 1903. 



Pileus in our plants 5 to 10 mm. broad. Spores somewhat 

 larger than the dimensions above given, averaging 10 to 12 x 5 

 to 6/n. 



Omphalia epichysia Pers. 



Pileus membranous, soft, expanded, umbilicate, hygrophan- 

 ous, sooty-gray and striate when moist, pallid when dry, silky or 

 flocculose. 



Lamellae narrow, subdistant, slightly decurrent, whitish or 

 cinereous. 



Stem- equal, somewhat hollow, glabrous, cinereous. 



Pileus 12 to 25 mm. broad; stem 2.5 cm. long, 2 mm. thick. 



Spores 8 to 10 x 4 to 5 p. (Massee) ; 7.5 x 4 p. (Peck). 



On rotten wood, River Forest. Autumn. The pileus is 

 beautifully striate when moist. Spores elliptic-oblong, 6 to 7 

 x 4 /A. 



Omphalia fibula Bull. 



Pileus membranous, commonly convex or hemispherical and 

 umbilicate, striatulate when moist, varying in color from pale 

 yellow to orange, even and paler when dry. 



