March 1907] North American Species of Agaricaceae 67 



Growing on the ground in door yards, etc. New York, 

 Peck. Pileus 2-3 cm. in diameter; stipe 10-15 cm. long 2 mm. 

 thick. When dry the plant bears some resemblance to large 

 forms of Galera tenera. 



12. PSATHYRELLA TREPIDA Fries, Epicrisis, 1839. 



ICONES, 139. 



Pileus membranaceous, campanulate, obtuse, glabrous, hy- 

 grophanous, fuliginous, closely striatulate, smooth in the center. 

 Stipe fistulous, nearly straight, glabrous, hyaline-pellucid. La- 

 mellae rather broad, ventricose, adnate, close, sooty-black; spores 

 12 mic. long. 



Growing in marshy ground. New England, Sprague. Pi- 

 leus 2-3 cm. in diameter; the stipe 6-9 cm. long, 1-2 mm. thick. 



13. PSATHYRELLA ATOMATA Fries, Syst. Myc. 

 I, 1 82 1. Cooke, Illustr. 638. 



Pileus submembranaceous, campanulate, obtuse, striatulate, 

 livid, when dry changing to whitish and rose-color, becoming 

 rugulose and sprinkled with shining atoms. Stipe lax, fragile, 

 white, furfurate at the apex. Lamellae broad, adnate, cinereous, 

 becoming black; spores elliptic, 13-15x6-8 mic. 



Growing on the ground in pastures, along roads, etc. New 

 York, Peck. Preston, O. Pileus 2-3 cm. diameter ; stipe 5-8 cm. 

 long, 2-4 mm. thick. 



14. PSATHYRELLA CRENATA Lasch, Linnaea, HI, 

 425, 1828. 



Pileus membranaceous, hemispheric, ochraceous or rufescent, 

 becoming pallid, plicate-sulcate, atomate, the margin crenate. 

 Stipe fragile, glabrous, whitish, striate above and farinaceous. 

 Lamellae rather broad, subventricose, adnate, at first yellow-brown 

 then blackening; spores elliptic, 9-11x5-6 mic. 



Growing on the ground in rose garden, Preston, O. Pileus 

 1.5-2.5 cm. in diameter; the stipe 3-5 cm. long, 2-4 mm. thick. 

 The specimens seem too near this species as described to be 

 named otherwise. 



15. PSATHYRELLA TENERA Peck, 47 N. Y. Rep. 



Pileus thin, campanulate, obtuse, reddish-cinereous when 

 moist, paler when dry, slightly rugulose and atomate. Stipe 

 slender, glabrous, stufl:"ed or hollow, white, with a white floccose 

 mycelium at the base. Lamellae broad, adnate, subdistant at first 

 pallid, then umber, finally blackening ; spores narrowly elliptical, 

 12-14 X 7-8 mic. 



Growing in marshy ground in open woods. New York, 

 Peck. Pileus 6-10 mm. in diameter; stipe 2.5-4 cm. long, scarcely 

 I mm. thick. The plant resembles small forms of Galera tenera. 



