26 THE CHICAGO ACADEMY OF SCIENCES 



KEY TO SPECIES. 



Margin of pileus even, lamellae adnate A. adnata. 



Margin of pileus deeply sulcate, lamellae free. .A. vaginata. 



Amanitopsis adnata Smith. 



Pileus pale buff-yellow, fleshy, very firm, almost rigid, some- 

 what moist, convex then expanded, buff beneath the cuticle, 

 margin extending beyond the lamellae. 



Lamellae adnate, crowded, white. 



Stem stuffed then hollow, pale buff, fibrillose ; volva lax, adnate 

 or almost obsolete, white, pubescent, remaining in wooly patches 

 on the pileus. 



Spores 10 x 8 /A. Pileus 6 to 7.5 cm. broad; stem 5 to 10 cm. 

 high, 1.5 cm. thick. 



Wooded sand dunes at the head of Lake Michigan, Millers, 

 Ind. June. 



Amanitopsis vaginata Bull. 



Pileus thin, slightly fleshy, campanulate then flattened, obtuse 

 and even, smooth or with a few fragments of the volva adhering, 

 margin wholly membranaceous and deeply sulcate-striate. 



Lamellae free, ventricose, not much crowded, shining white or 

 becoming pale. 



Stem hollow with spider-web fibrils within, attenuated equally 

 from the base; volva wholly free, sheathing, lax, fragile. Color 

 variable, white, livid, mouse-gray or tawny-yellow. 



Spores sphaeroid or subsphaeroid, 8 to 10 //.. Pileus 5 to 12.5 

 cm. broad; stem 15 to 20 cm. high, 5 to 2 cm. thick. 



In woods, throughout. July to September. Usually solitary. 

 Edible, but not especially recommended on account of the thin- 

 ness of the flesh. 



LEPIOTA. 



Plants with an annulus but no volva; hymenophore distinct 

 from the fleshy stem; lamellae free, often remote; annulus often 

 moveable; pileus usually scaly. Growing on the ground. Spores 

 white (greenish in L. Morgani). 



Margin of pileus even 1 



Margin of pileus more or less striate 7 



1. Ring movable on the stem 2 



Ring fixed '. 3 



2. Lamellae whitish L. procera. 



2. Lamellae greenish L. Morgani. 



3. Pileus beset with erect scales 4 



4. Pileus ferruginous-fuscous L. Friesii. 



4. Pileus whitish or yellowish L. acutesquamosa. 



3. Pileus with fibrillose or floccose appressed scales 5 



5. Scales soon disappearing near the 



margin L. cristata. 



5. Scales everywhere persistent L. rubrotincta. 



