40 THE CHICAGP ACADEMY OF SCIENCES 



glabrous, hygrophanous, reddish, grayish-red or reddish-brown 

 and often striatulate on the margin when moist, pallid or grayish 

 when dry. 



Lamella? narrow, crowded, free, whitish or yellowish-gray. 



Stem cartilaginous, equal, hollow, clothed with a dense some- 

 what pulverulent pubescence. 



Pileus 18 mm. to 4 cm. broad; stem 5 to 12 cm. long, 2 to 4 

 mm. thick; spores ovate or subelliptic, 5 to 6 x 3 to 4 p. 



In cespitose clusters among dead leaves in woods. Glen 

 Ellyn and Glencoe. August and September. 



Collybia zonata Pk. 



Pileus fleshy, thin, convex or nearly plane, umbilicate, fibril- 

 lose-tomentose, tawny or ochraceous-tawny, sometimes marked 

 with faintly darker zones. 



Lamellae narrow, close, free, white or whitish, with a white 

 pulverulent edge. 



Stem firm, equal, hollow, fibrillose-tomentose, tawny or 

 brownish-tawny. 



Spores broadly elliptical, 5 x 4 /A. Plant commonly cespitose; 

 pileus 12 to 25 mm. broad; stem 2.5 to 5 cm. long, about 2 mm. 

 thick. 



On dead sticks lying on the ground in moist woods, Glencoe. 

 August. "The pileus in our plants is often plainly zonate. 



Collybia strictipes Pk. 



Pileus thin, convex or nearly plane, glabrous, sometimes 

 slightly rugose on the disk, moist but scarcely hygrophanous, 

 whitish or pale yellow, paler when dry, often more deeply colored 

 on the disk. 



Lamellae thin, close, adnexed or almost free, white. 



Stem equal, straight, hollow, glabrous, slightly mealy or 

 pruinose at the top, white, often with a dense white myceloid 

 tomentum at the base. 



Spores ovate or subelliptical, pointed or subacuminate at one 

 end, 6 to 7.5 x4/x. Pileus 4 to 5 cm. brotid; stem, 4 to 6 cm. 

 long, 4 to 6 mm. thick. 



Growing in tufts on dead leaves in woods. August. Glen 

 Ellyn and Glencoe. Stems very strict, often 7 or 8 cm. long. 



Collybia acervata Fr. 



Pileus convex then flattened and obtuse, fleshy, glabrous, 

 reddish-brown and slightly striate on the margin when moist, 

 paler when dry. 



Lamellae at first adnexed, soon free, crowded, white. 



Stem slender, rigid, fistulose, very smooth except at the base, 

 reddish-brown. 



Spores ellipsoid, 6 x 3 to 4 /x. Pileus 5 to 7 cm. broad; stem, 

 5 to 10 cm. high, 2 to 4 mm. thick. 



The stems are often united at the base in a tuft of mycelium. 



