38 THE CHICAGO ACADEMY OF SCIENCES 



COLLYBIA. 



Stem fistulose, cartilaginous, stuffed with a pith and coated 

 with a cartilaginous cuticle, rooting; pileus slightly fleshy, margin 

 at first involute; lamellae free or only obtusely adnexed behind. ' 



Epiphytal on wood, leaves, &c., but often rooted in the ground. 

 Spores white. 



Lamellae white, yellowish or grayish " 1 



Lamellae dingy or cinereous 7 



1. Stem stout, stuffed, grooved or striate 2 



1. Stem thin, hollow or stuffed, velvety 4 



1. Stem hollow, smooth, lamellae narrow, crowded 5 



2. Pileus viscid when moist C. radicata. 



2. Pileus not viscid 3 



3. Pileus fibrillose C, platyphylla. 



3. Pileus glabrous C. maculata. 



4. Stem umber, becoming black C. velutipes. 



4. Stem reddish C. confluens. 



4. Stem tawny or brownish-tawny C. zonata. 



5. Stem yellowish or rufescent 6 



6. Lamellae crenulate, stem tapering up- 

 ward C. butyracea. 



6. Lamellae not crenulate, stem even. . , . . .C. dryophila. 



7. Pileus dark-brown when moist C. alcalinolens. 



7. Pileus livid-blackish when moist C. ignobilis. 



Collybia radicata Relh. 



Pileus fleshy but thin, convex or nearly plane, sometimes 

 somewhat umbonate, glabrous, viscid or even glutinous when 

 moist, often radiately wrinkled in the center, varying in color from 

 grayish-brown to dark-brown, sometimes almost white; flesh 

 white. 



Lamellae broad, subdistant, adnexed, shining white. 



Stem long, firm, glabrous, stuffed, slightly tapering upward, 

 at length striate or grooved, colored like or paler than the pileus, 

 ending in a long root-like extension which penetrates the earth 

 deeply. 



Spores elliptical with a slight apiculus at one end, 15 to 17 x 

 10 to 12 /u. Pileus 5 to 7.5 cm. broad; stem 10 to 20 cm. long, 

 4 to 6 mm. thick. 



Solitary, in woods or in lawns where the soil is filled with the 

 roots of trees. Common from June to frost. Edible. Small 

 specimens with the pileus pure white, and only 2.5 to 4 cm. broad, 

 are frequently found in shaded places in woods. The pileus in 

 these, as in the larger plants is glutinous. 

 Collybia platyphylla Fr. 



Pileus fuscous then cinereous, then whitish, fleshy-membrana- 

 ceous, thin, fragile, soon flattened, obtuse, watery when moist, 

 streaked with fibrils. 



Lamellae obliquely truncate behind, slightly adnexed, distant, 

 soft, white. 



