90 THE CHICAGO ACADEMY OF SCIENCES 



Agaricus campestris L. 



Pileus fleshy, varying white and rufescent, lens-shaped- 

 convex then flattened, obtuse, dry, sometimes silky-even, some- 

 times squamulose; flesh thick and soft, becoming reddish or 

 sometimes fuscous. 



Lamellae free, approximate, ventricose. equally attenuated at 

 both ends, crowded, often deliquescent, pallid flesh-color, at length 

 umber-fuscous. 



Stem stuffed, firm, short, bulbous when young, then somewhat 

 equal, even or squamulose, white; ring medial, spreading or re- 

 flexed, torn, often deciduous and sometimes in the form of a 

 cortina. 



On the ground in pastures, spring and autumn. Throughout 

 our district. Usually infrequent, but occasionally locally abund- 

 ant in autumn after rains. Edible. The common mushroom of 

 the shops. The annual product of the Chicago mushroom beds 

 is said to be from sixty to seventy-five tons, of which fifty tons 

 are consumed here, the remainder being shipped to nearby citi - 



Agaricus silvaticus Schaeff. 



Pileus somewhat ferruginous, scales rufescent or becoming 

 fuscous, thinly fleshy, oval then campanulate and flattened, 

 mewhat umbonate, the whole surface floi torn into squam- 



ules, the disk however often remaining continuous, and at length 

 denuded of scales, margin often rimosely incised; flesh thin, 

 fragile, white or rufescent. 



Lamellae free, ventricose, equally attenuated at both ends, 

 thin, arid, reddish then cinnamon-fuscous or umber-fuscous. 



Stem .-lender, at first stuffed with a cylindrical white pith, 

 then hollow, equal, ding} - white, fibrillose below the ring and even 

 above it. smooth: ring distant, simple, flocco-e beneath, some- 

 times wide but thin and membranous, sometimes narrow, in- 

 complete and fugacious. 



Pileus 7.5 cm. broad; stem 7.5 to '.) cm. long, about a cm. 

 thick. 



Wood.-. Lisle. August. Laxly gregarious. Lamellae at ! 

 rosy -pink, then reddish-brown, finally brownish-black. .Spores 

 broadly ellipsoidal, 5 x 3 ^. 



Agaricus silvicola Yitt. 



Pileus convex or subcampanulate, smooth, .-Inning white. 



Lamellae close, free, acute behind, whitish then slowly becom- 

 ing fuscous. 



Stem stuffed, elongated, bulbous, white: annulus simple. 



Pileus 7.o to lo cm. broad: stem 10 to 15 cm. long. 8 to 15 

 mm. thick; spores 6 to 8 x 4 to 5 /*. 



Woods, Glencoe. August. Infrequent. 



