March 1907] North American Species of Agaricaceae 55 



celium. Lamellae broad, close, attached, with a slight decurrent 

 tooth, dingy flesh-color, then rosy-brown, finally black ; spores 

 elliptic, 15 mic. long. 



Gregarious or subcaespitose ; growing about manure heaps. 

 New York, Peck; Preston, O. Pileus 3-5 cm. in diameter; the 

 stipe 5-7 cm. high, 2-4 mm. thick. 



4. PSATHYRELLA HIRTA Peck, 50 N. Y. Rep. 1896. 

 Pileus convex, hygrophanous, brown or reddish-brown and 



faintly striatulate when moist, grayish-brown when dry, the sur- 

 face adorned with tufts of white easily detersible and evanescent 

 hairs. Stipe fistulous, flexuous, squamulose and white. Lamellae 

 broad, adnate often with a decurrent tooth, at first pallid becom- 

 ing blackish-brown or black; spores elliptic, black, 12-14x6-8 

 mic. 



Subcaespitose ; growing on manure or rich soil in shaded 

 places. New York, Peck. Pileus 8-12 mm. in diameter; stipe 

 3-5 cm„ long, 2-3 mm. thick. 



h. Lamellae rather narroiv, adnexed or nearly free. 



5. PSATHYRELLA FALCIFOLIA Montagne, Syll. 

 Crypt. 399. 



Pileus membranaceous, at first globos.e then campanulate and 

 expanded, in the center smooth and yellowish, blackish and stri- 

 atulate around the margin. Stipe flexuous-incurved, fistulous, 

 rufescent, pallid and striate at the apex, the base sub-bulbous. 

 Lamellae narrow, falciform, rotundate-attached, pallid then 

 black; spores ovoid, 6-7 mic. long. 



Caespitose ; growing on bark and leaves. Columbus, Ohio, 

 Sullivant. Pileus 2-3 cm. in diameter, the stipe 4-10 cm. long 

 and 1-2 mm. thick. 



6. PSATHYRELLA RUPINCOLA Montagne, Syll. 

 Crypt. 400. 



Pileus membranaceous, hemispheric, umber or bay-brown, in 

 the center slightly depressed, thence to the margin striatulate. 

 Stipe fistulous, fragile, white, smooth, incurved-ascending. La- 

 mellae linear, attenuate-adnexed, pallid then fuliginous ; spores 

 sooty-black, oblong, 10 mic. in length. 



Growing out of fissures in rocks, the mycelium rooting in 

 fragments of rotten wood. Columbus, Ohio, Sullivant. Pileus 

 2 cm. high, 3 cm. in diameter ; the stipe 5-8 cm. long, 3-4 mm. 

 thick in the middle, 5-6 mm. thick at the base. 



7. PSATHYRELLA DEBILIS Peck, Bull. Torr. Club, 

 1896. Sylloge XIV, 162. 



Pileus membranaceous, campanulate, umbonate, whitish, at 

 length grayish, striatulate. Stipe slender, weak, flexuous, hollow. 



