LEUCOSPORI. 133 



In mixed woods, among moss. Frequent. July-Nov. Mycena. 



Name — ater, black ; albus, white. From the two distinct colours. Bolt. t. 

 137. Fr. Monogr. i. p. 212. Hym. Eur. p. 140. Berk. Out. p. 124. C. 

 Hbk. n. 184. S. Mycol. Scot. n. 157. 



276. A. dissiliens Fr. — Pileus cinereous-fuscous, whitish round 

 the margin, somewhat membranaceous, acorn-shaped then con- 

 ico-campanulate, not flattened, but revolute at the margin, sidcate 

 to the middle, dry. Stem short, 5 cent. (2 in.) long, attenuated 

 upwards from the strigose base, 2-4 mm. (1-2 lin.) thick, somewhat 

 i7icurved, smooth or pruinate, juiceless, slightly striate under a 

 lens, cinereous, split aftd breaking asunder into revolnte Jiaps 

 when compressed or bent. Gills rounded behind, separating-free, 

 broader in front and running out at the very obtuse truncate apex, 

 soft, watery, whitish or cinereous at the base, the shorter ones 

 crisped. 



Very fragile, with a vapid odour (not nitrous). In shady places the pileus 

 is commonly covered over with a fibrillose network and hoary silky pruina. 

 In natural afifinity very nearly conjoined with A. atro-albus, but in habit it 

 rather resembles A. galericulatus or A. alkalinus. 



On trunks, branches, &c. Frequent. July-Nov. 



Name — dissilio, to burst asunder. From the manner in which the stem 

 splits. Fr. Monogr. i. p. 213. Hym. Eur. p. 141. Icon. t. 81. f. 2. Berk. 

 Out. p. 125. C. Hbk. n. 185. Illust. PI. 285. a. S. Mycol. Scot. n. 158. 

 A. pseudoclypeatus Bolt. t. 154. A. metatus Seer. Mich. Gen. t. 79. f. 5. 

 Paul. t. \2.2..f. 8. 



277. A. atro-cyaneus Batsch. — Pileus 6-10 mm. (3-5 lin.) 

 broad, of one colour, fuscous then becoming azure-blue-grey, 

 membranaceous, campanulato-convex, at length flattened, gib- 

 bous, with an irregularly shaped, somewhat angular, wrinkled, 

 obtuse, fuscous blackish umbo, deeply sulcate (even when dry) to 

 the umbo, sprinkled with white powder which is easily rubbed off. 

 Stem 4-5 cent. {lYz-i in.) long, fistulose, flz/orm, slightly attenu- 

 ated from the slightly bulbous base, almost equal, rigid, fragile, 

 even, smooth, dark blue-black. Gills joined in a collar, attenuato- 

 adnate, ventricose, distinct, distant, white. 



Fragile, inodorous. Its affinity is not fully apparent. The figure of Batsch 

 is from a small and imperfectly developed specimen. 



In fir woods. Ascot, 1865, &c. Sept.-Nov. 



Name — ater, black ; cyaneus, dark-blue. Batsch f. 87. Fr. Monogr. \. p. 

 203. Hym. Eur. p. 141. B. b^ Br. n. 1213, 1640*. S. Mycol. Scot. n. 139. 

 C. niust. PL 236. b. 



278. A. pullatus Berk. & Cke.— Pileus i8 mm. {% in.) broad, 



