The Agaricaceae of Ohio. 571 



C.^ Pileus usually less than 3 cm. broad ; stipe hollow. 

 S. 1 122; St. 341; Mc. 386; H. 344; J. M. 13:59. 



P. papilionacens Fr. 

 B.^ Pileus tan to smoky-black, etc., not white. 



C.^ Pileus with brown or blackish zone about the 

 margin. 

 D.^ Pileus conical, acutely umbonate. S. 1124; St. 



342 ; J. M. 13 :59 P. acuminatus Fr. 



D.^ Pileus campanulate, not umbonate. S. 1124; St. 

 342; Mc. 385; J. M. 13:59; M. 116; H. 342. 



P. fimicola Fr. 

 C.- Pileus not zoned about the margin. 

 D.^ Pileus moist or hygrophanous. 



E.^ Pileus sooty-black when moist, not reticulate. 

 S. 1 121; St. 340; J. M. 13:60. 



P. sphinctrinus Fr. 

 E.- Pileus tan or brown, usually pink-tinged, 

 reticulate-rugose. S. 11 20; St. 340; A. 

 45 ;H. 339; Mc. 384; J. M. 13:61. 



P. retirugis Fr. 

 D.^ Pileus dry, not hygrophanous. 



E.^ Pileus hemispherical ; lamellae very broad. 

 S. 1 122; St. 341 ; Mc. 386; H. 344; J. M. 



13 : 59 P. papilionaceus Fr. 



E.^ Pileus campanulate. S. 1121; St. 340; Mc. 

 386; J. M. 13:60; H. 342; M. 116. 



P. campanulatiis Linn. 

 Notes. 



P. fimiputris is often placed in the genus Anellaria. 

 P. phalaenarum has not been definitely reported from 

 Ohio. 



PSATHYRELLA FR. 



A.^ Pileus sulcate or plicate-sulcate. 



B.^ Pileus less than 15 mm. broad, whitish to cinereous; 

 common. S. 1134; St. 346; Mc. 391; J. M. 13:54; H. 

 347; A. 48; M. 117 P. disseminata Pers. 



