24 



Both of the stations cited are along the shores of the Susque- 

 hanna River, the plant growing in the water. 



A KEY TO THE NORTH AMERICAN SPECIES OF 



STROPHARIA 



By F. S. Earle 



1. Stipe comparatively short and thick (jPsa/tiota-like) ; on the ground. 2 

 Stipe elongated, slender (Panatohis-like) ; on manure. 8 



2. Pileus whitish or yellowish-white. 3 

 Pileus yellow, orange or yellowish-brown. 5 

 Pileus green or greenish. 7 



3. Pileus white, center brownish ; lamellae bluish-brown. S. caesifolia Pk 

 Pileus white or yellowish-white ; lamellae dark-brown. 4 



4. Lamellae adnate ; stipe short (2.5 cm.). 5. bilamellata Pk 

 Lamellae slightly adnexed ; stipe 5-10 cm. S. Johnsoniana (Pk. ) Pk 



5. Pileus glabrous, large (8-15 cm.), brownish-yellow. S. depilata (Pers. ) Sacc 

 Pileus squamulose, smaller (3-7 cm.). 6 



6. Pileus ochraceous ; lamellae crowded. S. squamosa (Fr. ) Quel 

 Pileus orange ; lamellae subdistant. S. squamosa aurantiaca (Cke. ) Pk 



7. Pileus verdigris-green, large (8-1 1 cm.); stipe bluish. 



S. aeruginosa (Curt.) Gillet 

 Pileus greenish to whitish, small (2-3 cm.); stipe whitish. 



S. albo-cyanea (Desm.) Gillet 



8. Stipe glabrous. 9. 

 Stipe floccose or fibrillose. 10. 



9. Stipe glutinous; pileus obtuse. 5. semiglobata (Batsch) Gillet 

 Stipe dry ; pileus umbonate. S. umbonatescejis (Pk.) Sacc. 



10. Stipe subviscid ; spores large (18-20 fi X IO-13 //). S. stercoraria (Fr. ) Gillet 

 Stipe dry ; spores smaller (12-15 /i X 7~9 I 1 )- S. siccipes Karst. 



The following species that have been referred to Stropharia 

 are omitted : 



Stropharia irregularis Pk. Bull. Torrey Club, 27: 16. 1900. 

 This as I am informed by Professor Peck is probably only a 

 form of HypJioloma incertum Pk. in which the veil is somewhat 

 strongly developed. The distinction between Hypholoma and 

 Stropharia is at best an artificial one since in each there is a fully 

 developed cortina when young. 



Agariats [Stropharia) Howeanus Pk. Reg. Rep. 26 : 59. 



