July 1907] North American Species of Agaricaccae 145 



concolorous, mealy at the summit, white fibrillose below. La- 

 mellae broad, sub-distant, adnate or subdecurrent, colored almost 

 like the pileus ; spores purple-brown, subelliptic, 7-8 x 5 mic. 



Growing on the ground among Polytrichum. New York, 

 Peck. Pileus 4-10 mm. in diameter; stipe 3-5 cm. long. 



7. DECONICA BRYOPHILA Peck, 46 N. Y. Rep. 1892. 



Pileus submembranaceous, somewhat conical, becoming con- 

 vex or nearly plane, glabrous, hygrophanous, brown and striat- 

 ulate on the margin when moist, pallid or grayish when dry. 

 Stipe slender, fistulous, silky-fibrillose, pallid or brown. La- 

 mellae broad, distant, adnate or subdecurrent, at first pale brown, 

 becoming purplish-brown ; spores brown, elliptic, 7-8 x 5 mic. 



Growing in sandy soil among mosses. New York, Peck. 

 Pileus 6-12 mm. in diameter; stipe 1.5-2.5 cm. long. 



h. Not groiving among mosses. 



8. DECONICA ATRORUFA Schaeffer, Index 1774. 

 Agaricus montanus Persoon, Synopsis, 1801. 



Pileus fleshy, hemispheric-convex, obtuse, glabrous, dark 

 rufous or purple brown, the margin striatulate, when dry smooth 

 and expallent. Stipe slender, equal, fistulous, glabrous or fib- 

 rillose, pale brown. Lamellae broad, subdecurrent, umber ; spores 

 ovoid, 6-8 x 4-5 mic. 



Growing in open sandy, gravelly places and in woods. N. 

 Carolina. Schz^'cijiit::. Pileus 1-2 cm. in diameter; stipe 3-5 

 cm. long, 2 mm. thick. 



9. DECONICA AMMOPHILA Durieu et Leveille, 

 ExPL. scientifique de l' Algerie. Cooke Illustr. 606. 



Pileus fleshy hemispheric, then expanded, subumbonate, gla- 

 brous, yellowish-brown. Stipe tapering upward from an elon- 

 gated clavate base sunk in the sand, the upper portion white and 

 hollow. Lamellae rather narrow, subdecurrent by a tooth, smoky, 

 black-pulverulent; spores elliptic, 8-10x5-6 mic. 



Growing in the sand along the Ohio river, Morgan, and 

 near Lake Erie, KcUcrinan. Pileus 3-4 cm. in diameter; stipe 

 4-6 cm. long. The rooting base emits fibrous rootlets which 

 clothe it with a layer of sand. 



10. DECONICA SEMISTRIATA Peck, 51 N. Y. Rep. 

 1897. 



Pileus fleshy, thin except on the prominent, broadly um- 

 bonate disk, glabrous, striatulate, grayish brown, paler when 

 dry, the umbo yellowish. The stipe short, equal, stufifed, floe- 



