Saprophytic Fungi of Eastern Iowa. 187 



32. Agaricus hypnorum, Batsch. 



Pileus pale brown, membranaceous, campanulate, smooth, 

 striate, hygrophanous; lamella? adnate, broad, remote, pale 

 cinnamon; stipe slender, flexuous, concolorous, pruinose above. 



Height I'-i^'. Pileus ){' -Yz' . Spores .oo6x-oi2 mm. 



A delicate little plant, common in spring on fresh, green 

 tufts of various mosses, in damp woods. 



Subgenus Crepidotus. 

 Pileus excentric, lateral or resupinate. 



33. Agaricus mollis, Schatff. 



Pileus gelatinous-fleshy, soft, obovate or reniform, sessile, 

 smooth, pallid becoming canescent; lamella? decurrent, crowd- 

 ed, linear, tawny. 



Pileus }{'-i}4'. Spores elliptic, .005 x .009 mm. 



Common on fallen trees and branches, particularly on 

 species of Populus. "Variable in form and color, either soli- 

 tary or imbricated. September-December. 



SERIES IV. PRATELLI.— The Purple-Spored Agarics. 

 Spores blackish-purple or purplish-brown, rarely fuscous." 



Subgenus PsaUiota? 

 Stipe annulate and lamellse free. 



34. Agaricus arvensis, Schceff. 



Pileus white or smoky-tinted, conic-campanulate, at length 

 explanate, at first floccose-farinose, then nearly glabrous; 

 lamellge free, outwardly broadening, at first white, then some- 

 what tinged with pink, at last blackish brown; stipe hollow 

 with floccose pith; annulus pendulous, large, double, the outer 

 part radiately cleft. 



1 Cooke's Handbook of British Fungi. 



2 In Saccardo's enumeration of Agaricine species, where all the sections 

 here referred to as subgenera are raised to the rank of genera, the generic 

 name Agarkus, L , supplants Psalliota, Fr., so that the three species 34, 35 and 

 36 may be considered as Agarics par excellence. 



