118 
Mycologia 
it among the dangerous species, but its properties have probably 
not been thoroughly investigated. Even if harmless, it is too 
small and thin to be considered for food. The color varieties 
of this species had already received several specific names before 
Persoon grouped them under Agaricus piiriis. 
Collybia platyphylla (Fries) Quel. 
Broad-gilled Collybia 
Plate 158. Figure 4. X i 
Pileus large, thin, fragile, convex to expanded, 8-15 cm. broad ; 
surface whitish to grayish-brown or dark-brown, at times darker 
on the disk, innately fibrillose to subglabrous, margin often up- 
turned with age ; context white, sometimes with a faint agreeable 
odor; lamellae adnexed, very broad, usually deeply emarginate, 
subdistant, white ; spores subglobose or broadly ellipsoid, smooth, 
hyaline, 7-10 X 6-7 /a; stipe equal or tapering upward, often stri- 
ate, whitish, sometimes slightly pulverulent at the apex, fleshy, 
stufifed or hollow, 7.5-12 cm. long, 2 cm. thick. 
This large, conspicuous species is abundant throughout most of 
temperate North America and Europe, occurring in thin woods 
on and about deciduous logs and stumps, from June to October. 
The collector is apt to assign it to the genus Melanolenca, because 
of its sinuate lamellae and rather fleshy stipe, but it may be dis- 
tinguished from most of the species of this genus by its wood- 
loving habit. Although edible, it is quickly attacked by insects 
and also decays rapidly, so that it is practically of very little eco- 
nomic importance. 
Lepiota amianthina (Scop.) Quel. 
Granulose Lepiota 
Plate 158. Figure 5. X i 
Pileus ovoid to campanulate and expanded, subumbonate, 2-6 
cm. broad; surface finely to coarsely granulose, ochraceous to 
reddish-ferruginous varying to pallid or pinkish; context thin, 
white or yellowish, often with a disagreeable odor; lamellae free 
