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 ^.: pileus 2..") to 3 cm. 

 broad; stem 10 to 15 em. 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 straighl margin of the pileus at first appressed to the stem. 



Spores black. 



Pileus slightly striate, sprinkled with shining 



atoms' . . P. atomata. 



Pileus sulcate, not atomate P- disseminata. 



Psathyrella atomata Ft. 



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 nun. to 2.5 cm. broad; stem 2..') to 5 cm. Ion-. 2 nun. 

 thick. 



Ground in woods, (den Ellyn. September. Pileus livid 

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

 dry; lamellae Livid-fuliginous, f<Vzr> 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 ."> or ti cm. Ion-, aboul 2 mm. thick. Spores 

 ellipsoid, 11 to 12 x 7 to 8 fi. 

 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. 



