48 



Among mosses in woods. Adirondack Mountains. July. 



Usually the whole plant is pure white, but sometimes the pileus 

 has a delicate rosy hue except on the apex and the margin. The 

 striations of the pileus remain in the dried specimens. The papilla 

 is sometimes very prominent, sometimes wanting. 



Agaricus (Myceua) miratuS; Peck. 



Pileus thin, campanulate, umbilicate, sraootli, striate, cinereous ; lamellae 

 narrow, slightly uncinate, whitish; stem long, filiform, smooth, whitish, 

 radicating, villous at the base. 



Plant 1.5'-3' high, pileus o"-4" broad. 



Among fallen leaves in copses. Center. October. 

 This species may be known by the umbilicate pileus and the long 

 striae which extend to the umbilicus. 



Agaricus (Omplialia) olivariusj Peck. 



Pileus convex, umbilicate, smooth, yellowish-olive ; lamellae arcuate, decur- 

 rent, subdistant, pale yellow ; stem equal, short, smooth, hollow, colored like 

 the pileus; spores subglobose or broadly elliptical, .00026' long. 



Plant 1-1.5' high, pileus 1' broad, stem 1" thick. 



Burnt ground under balsam trees. North Elba. July. 



Agaricus (Omplialia) rugosodiscusj Peck. 



Pileus thin, convex, then expanded, smooth, hygrophanous, striatulate when 

 moist, brown, rugose-wrinkled on the disk, the thin margin often wavy ; lam- 

 ellae narrow, close, arcuate, decurrent, white; stem equal, short, smooth, 

 hollow, often curved, whitish. 



Plant l'-1.5' high, pileus 6"-12" broad, stem .5" thick. 



Decaying prostrate trunks of trees in woods. Croghan and Wor- 

 cester. July and September. 



Agaricus (Pluteus) slerilomarginatusj Peck. 



Pileus broadly convex or expanded, with a slight appressed tomentum, 

 white faintly tinged with pink, the thin margin exceeding the lamellae ; 

 lamellae close, subventricose, free, minutely eroded on the edge, pale flesh 

 color; stem short, equal, solid, smooth, whitish ; spores subglobose, angular, 

 with a central nucleus, .00025' in diameter. 



Plant 1' high, pileus 6"-13" broad, stem .5" thick. 



Decaying woods and sticks in woods. Portville. Sci)tember. 

 The pileus is sometimes cracked and then has the appearance of 

 being coated with a thin scaly paste. 



