150 Journal of Mycology [Vol. 13 



rather broad, ventricose, subadnate, brownish-red, becoming pur- 

 plish-brown ; spores blackish-brown, 12-15 x 7-8 mic. 



Growing among chip dirt. New York, Peck. Closely re- 

 lated to Ps. limbata. The umbo is very prominent. 



14. PSATHYRA SULCATA, Psathyrella sulcata 

 Clements, Neb. Rep. III. 1893. 



Pileus campanulate then expanded, smooth and yellow in the 

 center, gray verging into black beyond and deeply radiately sul- 

 cate. Stipe slender, fistulous, smooth, shining, white above, ru- 

 fescent below. Lamellae adnexed, slightly ventricose, cinereous, 

 then brownish-black ; spores ovoid, fuscous or brownish-purple. 

 8-10 X 5-6 mic. 



Growing on the ground. Lincoln, Neb., Clements. Pileus 

 1-2.5 cm. in diameter; stipe 4-6 cm. long, 1-2 mm. thick. 



15. PSATHYRA HYMENOCEPHALA, A. (Hypho- 

 loma) hymenocephalus Peck, 31 N. Y. Rep. 1878. 



Pileus thin, fragile, campanulate, then expanded, sometimes 

 umbonate, hygrophanous, brown and striatulate when moist, pal- 

 lid or whitish and radiately rugulose when dry, subatomate ; the 

 whitish veil evanescent. Stipe slender, brittle, hollow, striate 

 and mealy at the summit, white. Lamellae narrow, close, dingy 

 then brown ; spores brown, elHptic, 7-8 x 4 mic. 



Growing on the ground in the shade of alders. New York, 

 Peck. Pileus 3-5 cm. in diameter; stipe 7-10 cm. long, 2-3 mm. 

 thick. Apparently referable to Psathyra in every way except the 

 sHght evanescent veil. 



IL FIBRILLOSAE. Pileus and stipe from the first 

 floccose-scaly or fihrillosc. 



a. Pileus striatulate, at least when wet. 



16. PSATHYRA FIBRILLOSA Persoon, Synopsis, 

 1801. Fries Hym. Eur. 1874. Karsten, Hattsvmpar. 



Pileus submembranaceous, campanulate-convex then ex- 

 panded, striatulate, at first fibrillose, livid, white when dry. Stipe 

 elongated, very fragile, white, fibrillose-scaly. Lamellae adnate, 

 plane, very broad behind, purple-black, spores dark purple. 



Growing on the ground among old leaves. New England, 

 Frost. Pileus 3-4 cm. in diameter, the lamellae 7-1 1 mm. iDroad, 

 stipe 8-12 cm. long, 4-7 mm. thick. Berkeley's figure in Cooke's 

 Ilhistrations does not appear to be this species. 



