NATURAL HISTORY SURVEY 41 



Among dead leaves in woods. June to August. 

 Collybia butyracea Bull. 



Pileus fleshy, thin, convex then expanded, unbonate, smooth, 

 reddish-brown, becoming paler with age, moist in wet weather, 

 flesh dingy or whitish when moist, white when dry. 



Lamellae thin, crowded, crenulate, adnexed or almost free, 

 white. 



Stem commonly tapering upward, glabrous, striate, reddish or 

 reddish-brown, usually with a white tomentum on the thickened 

 base, white within, stuffed or hollow. 



Pileus 3 to 7.5 cm. broad; stem, 3 to 7.5 cm. long, 4 to 6 mm. 

 thick at the top, thicker at the base. Spores 6 to 7.5 x 3 to 4 /u. 



On the ground in pine woods. Millers, Ind., October. 

 Collybia dryophila Bull. 



Pileus thin, convex or nearly plane, sometimes with the margin 

 elevated, irregular, obtuse, glabrous, varying in color, commonly 

 some shade of bay-red or tan-color; flesh white. 



Lamellae narrow, crowded, adnexed or almost free, white or 

 whitish, rarely yellowish. 



Stem equal or sometimes thickened at the base, cartilaginous, 

 glabrous, hollow, yellowish or rufescent, commonly similar in 

 color to the pileus. 



Spores 6 to 7.5 x 3 to 4 /A. Pileus 2.5 to 5 cm. broad; stem 

 2.5 to 5 cm. long, 2 to 4 mm. thick. 



Common in woods, summer and autumn, on dead sticks and 

 among fallen leaves. Spores elliptic-fusiform, occasionally pip- 

 shaped, about 7 x 4 /x. 



Collybia alcalinolens Pk. 



Pileus thin, subconical, convex or nearly plane, glabrous or 

 silky-fibrillose, hygrophanous, dark-brown and sometimes striatu- 

 late on the margin when moist, grayish-brown or cinereous when 

 dry, shining; flesh white, odor strong, alkaline. 



Lamellae broad, subdistant, deeply emarginate or adnexed 

 with a slight decurrent tooth, somewhat ventricose, whitish. 



Stem shining, glabrous, slightly pruinose at the top, hollow, 

 whitish. 



Spores broadly elliptical, 7.5 to 9 x 4 to 5 //.. Pileus 16 to 36 

 mm. broad; stem, 2.5 to 5 cm. long, 2 to 6 mm. thick. 



Woods, Glen Ellyn. May. Gregarious about decaying 

 stumps. The plant has a strong odor, resembling that of chloride 

 of lime. 



Collybia ignobilis Karst. 



Pileus slightly fleshy or membranaceous, slightly convex or 

 plane with the disk slightly depressed, glabrous, livid when moist, 

 with a grayish reflection and the spreading margin striatulate, 

 grayish or pallid when dry. 



Lamellae close, dingy or pale, emarginate. 



