Murrill: Dark-spored Agarics 



205 



Collected by E. B. Sterling on June 7, 1902. The types at 

 Albany are in excellent condition. 



7. Agaricus chlamydopus Peck, Bull. N. Y. State Mus. 94: 36. 



1905 



Agaricus cothurnatus Peck, Bull. Torrey Club 31: 181. 1904; 

 not A. cothurnatus Fries, 1838. 



Pileus fleshy, convex, with an involute margin, 5-7.5 cm. broad; 

 surface dry, glabrous or minutely pulverulent on the margin, 

 chalky-white ; context white ; lamellae crowded, free, chocolate- 

 colored becoming black; spores subglobose, 8-9 x 7— Sfi; stipe 

 nearly equal, white, with dense root-like fibers at the base, sheathed 

 below by the white veil, which forms a cup-like annulus with its 

 upper margin lacerate, 3-5 cm. long, 10-12 mm. thick. 



Type locality : Denver, Colorado. 

 Habitat : In rich soil along roadsides and paths. 

 Distribution : Known only from the type locality. 

 Type collected by E. B. Sterling on July 25, 1902. The dried 

 plants still retain their chalky whiteness. 



8. Agaricus campester L. Sp. PI. 1173. 1753 



Pileus convex to expanded, 5-9 cm. broad ; surface dry, silky 

 and whitish, or floccose-squamulose and light-reddish-brown, the 

 color being chiefly in the scales ; context white, thick, solid, of mild 

 flavor, usually not changing color when bruised ; lamellae free* 

 rounded behind, ventricose, crowded, pale-pink when young, be- 

 coming salmon-pink, and finally brown or blackish ; spores ellip- 

 soid, smooth, pale-purplish-brown under the microscope, blackish- 

 brown in mass, about 7x4^; stipe smooth, white, cylindric, nearly 

 equal, stuffed within, 3-6 cm. long, 1-1.5 cm. thick; annulus above 

 or near the middle of the stipe, simple, white, often evanescent. 



Type locality : Europe. 



Habitat: Wild in meadows and rich pastures; cultivated in 

 caves, mines, houses, etc. 



Distribution : Cosmopolitan. 



Illustrations : Ann. Rep. N. Y. State Mus. 48 : pi, 6; Atk. 

 Stud. Am. Fungi, /. 1-8 ; Barla, Champ. Nice, pi. 27 ; Bull. Herb. 

 Fr. pi. 134; Cooke, Brit. Fungi, pi. 526 (544) ; Fries, Sv. Aetl. 

 Svamp. pi. 5; Gibson, Edible Toadst. pi. 5, 6; Gill. Champ. Fr. 



