COPRINARII. 



343 



XXXVI. Agaricus (Psathyrella) 

 disseminatus. One-half natural 



size. 



not variegated, and not becoming fuscous or purple. In appear- Psathyrella. 

 ance wholly like Psathyra. Spores black on a white ground, but 

 in one or two species slightly fuscous 

 when deposited on a black ground. 

 Fr. Hym. Eur. p. 313. 



The straight margin of the pileus 

 is adpressed to the stem. Thinner 

 than Psathyra. 



* Stem tense and straight, smooth. 



* Stemflexuozts, pruinate at the apex. 



* Stem tense and straight, smooth. 



772. A. subatratus Fr. Pileus 



2.5 cent, (i in.) high, and when ex- 

 panded 5 cent. (2 in.) broad, umber- 

 rufescent, pallid-rufescent when dry, 

 membranaceous, campanulate, ob- 

 tuse, smooth, even, slightly striate 

 round the margin. Stem 10-12.5 



cent. (4-5 in.) long, 2 mm. (i lin.) and more thick, fistulose, tense 

 and straight, equal, even, smooth, not pruinate, becoming pale- 

 white. Gills adnexed in the top of the cone, aclnate \vhen the 

 pileus is more expanded, linear, scarcely beyond 2 mm. (i lin.) 

 broad, crowded, fuliginous-blackish, almost umber, edge of the 

 same colour. 



Spores shining black. Gregarious, fragile. The above is the typical form. 

 In an intermediate form the stem is shorter, 5-7.5 cent. (2-3 in.); in a smaller 

 form the stem is only 2.5 cent, (i in.), the pileus somewhat umbonate, fuligin- 

 ous when moist, somewhat olivaceous, the gills ventricose, 4 mm. (2 lin.) 

 broad. 



On rich ground. Batheaston, 1869. Sept. 



Spores pruniform, 12-15 mk. Q. Name sub, and ater, dead black. Black- 

 ish. Fr. Monogr. \\. p. 305. Hym. Eur. p. 313. B. & Br. n. 1260. 



773. A. gracilis Fr. Pileus i 2.5 cent. ()4-i in.) broad, fulig- 

 inous, livid, c., when dry tan, rosy or whitish, hygrophanous, 

 membranaceous, campanulate, obtuse, smooth, even, slightly and 

 pellucidly-striate only round the margin. Stem 7.5 cent. (3 in.) 

 and more long, scarcely 2 mm. (i lin.) thick, fistulose, remarkably 

 tense and straight, equal, naked, smooth, whitish, not rooted, 

 white-Dillons at the base. Gills wholly adnate, commonly broader 

 behind (rarely linear), almost distant, distinct, at first whitish, 

 then cinereous-blackish with the black spores, edge rose-coloured. 



