COPRINARII. 



343 



not variegated, and not becoming fuscous or purple. /;/ appear- Psathyiella. 

 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. Hy7ii. Eur. p. 313. 



The straight margin oT the pileus 

 is adpressed to the stem. Thinner 

 than Psathyra. 



* Stem tense and straight, smooth, 

 ** Stemflcxuons, pruinate at the apex. 



ii) 



XXXVI. Agaricns (Psathyrella) 

 disseniinatus. One-half natural 

 size. 



* Stem tense and straight, sniootJi. 



11% A. subatratus Fr. — Pileus 



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

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

 7'ufeseent, pallid-rafescent 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, beconmtg pale- 

 white. Gills adnexed in the top of the cone, adnate when 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 ^''^k. Q. Name — sub, and ater, dead black. Black- 

 ish. Fr. Monogr. ii. p. 305. Hym. Eur. p. 313. B. of Br. n. 1260. ■ 



773. A. gracilis Fr. — Pileus i 2.5 cent. (K-i in.) broad, /////>- 

 ittous, livid, &c., when dry tan, rosy or whitish, hygrophanous, 

 membranaceous, cainpamtlate, obtuse, smooth, eveii, 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, 7iot rooted, 

 white-villous 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. 



