100 THE CHICAGO ACADEMY OF SCIENCES 



ANELLARIA. 



Pileus somewhat fleshy, not striate, projecting beyond the 

 lamellae at the margin; lamellae variegated from the groups of 

 dark spores on the surface; annulus present. Spores black. 



Anellaria separata L. 



Pileus clay-whitish, slightly fleshy, ovate-campanulate, obtuse, 

 even, smooth, viscous. 



Lamellae adnate but almost separating, ascending, cinereous- 

 black. 



Stem fistulose, tense, straight, rigid, slightly attenuated from 

 'the thickened base, whitish, even, striate under a lens, smooth, 

 naked. Ring distant, entire, persistent, white. 



Spores ellipsoid, 16 to 22 x 10 to 12 /x.; pileus 2.5 to 3 cm. 

 broad; stem 10 to 15 cm. high. 



On horse dung in woodland pastures. May to September. 

 In our plant the ring often disappears with age. 



PSATHYRELLA. 



Veil not woven, scarcely conspicuous; pileus membranous, 

 striate, margin not exceeding the lamellae; lamellae equally 

 black-fuliginous, not variegated. Stem with a cartilaginous rind; 

 the straight margin of the pileus atT first appressed to the stem. 

 Spores black. 

 Pileus slightly striate, sprinkled with shining 



atoms P. atomata. 



Pileus sulcate, not atomate P. disseminata. 



Psathyrella atomata Fr. 



Pileus livid, when dry becoming pale tan or pale flesh-color, 

 hygrophanous, membranous, campanulate, obtuse, slightly striate 

 when moist, sprinkled with' shining atoms. 



Lamellae adnate, broad, ventricose, slightly distant, distinct, 

 whitish becoming cinereous-blackish with the spores. 



Stem lax, fragile, white, the apex white-furfuraceous. 



Pileus 12 mm. to 2.5 cm. broad; stem 2.5 to 5 cm. long, 2 mm. 

 thick. 



Ground in woods. Glen Ellyn. September. Pileus livid 

 when moist, becoming pale-whitish with the disk flesh-color when 

 dry; lamellae livid-fuliginous, edges whitish; stems curved at the 

 base, arising from a plexus of white, cottony threads which usually 

 bind together a small mass of vegetable mold. Pileus 12 to 25 

 mm. broad; stem 5 or 6 cm. long, about 2 mm. thick. Spores 

 ellipsoid, 11 to 12 x 7 to 8 /x. 



Psathyrella disseminata Pers. 



Pileus whitish or yellowish changing to cinereous, commonly 

 livid, the disk becoming yellow, membranaceous, oval then 

 campanulate, at first scurfy then smooth, sulcate. 



