LEUCOSPORI. 99 



longation of the stem itself. Rhizomorpha xylostroma Ach. in Vet. Ac. Collybia. 

 Handl. 1814, /. g.f. 7 represents the very singular mycelium. Name repens, 

 creeping. Fr. Monogr. i. /. 148. Hym. Eur. p. no. Icon. t. 61. Berk. 

 Out. p. 114. 



198. A. semitalis Fr. Pileus 2.5-10 cent. (1-4 in.) broad, 

 when fresh moist, pitch-black, fuliginous or smoky-livid, hygro- 

 phanous, when dry sometimes becoming pallid cinereous-yellow 

 or isabelline, sometimes grey, fleshy-cartilaginous, thin, convex 

 then plane, obtuse, even, smooth; the margin at first inflexed 

 and smooth, then spreading and slightly pellucid-striate ; flesh 

 thin, scissile, moist when in vigour, white when dry. Stem 5-10 

 cent. (2-4 in.) long, 6-8 mm. (3-4 lin.) thick, at first stuffed, then 

 somewhat hollow, tough, elastic, attenuated from the somewhat 

 bulbous and often bluntly-rooting base, fibrilloso-striate, slightly 

 fuscous- or cinereous-white, naked at the apex. Gills obtuse 

 (attenuated or rounded) behind, adfixed in the form of a ring with 

 a small tooth which is decurrent on the stem, somewhat distant, 

 broad, distinct, white then becoming cinereous, spotted black when 

 touched, and at length becoming black, but the spores white. 



Sometimes caespitose. Its true affinity and place are very doubtful ; from 

 its habit it belongs to this group, but it grows on the ground, and the cuticle 

 of the stem, which is fibrous internally, is membranaceous. It is wholly some- 

 what cartilaginous, however, somewhat tough, most variable in its dimensions. 

 B. Stem sometimes curt, 2.5 cent, (i in.) long, 4mm. (2 lin.) thick, equal, 

 but curved-ascending, wholly solid ; pileus piano-depressed, irregular, less 

 hygrophanous. C. Stem solid, bulbous (the bulb as much as 2.5 cent, (i in.) 

 thick), &c. The gills, however, always present marks by which it may be safely 

 distinguished from all others. 



By waysides after much rain. Coed Coch. Oct.-Nov. 



Name semitalis, pertaining to footpaths or byways. Fr. Monogr. \.p. 146. 

 Hym. Eur. p. no. Icon. t. 62. B. & Br. n. 1739. C. Illust. PL 292. 

 Buxb. C. iv. t. 14. 



199. A. fusipes Bull. Pileus 4 cent. (i% in.) broad, rufescent- 

 r eddish-brown, becoming pale and also dingy tan, fleshy, convex 

 then flattened, umbonate (the umbo at length vanishing), even, 

 smooth, dry, here and there broken up in cracks when dry. Stem 

 7.5 cent. (3 in.) and more long, commonly 12 mm. ()4 in.) but 

 here and there as much as 2.5 cent, (i in.) broad, fibrous-stuffed 

 then hollow, remarkably cartilaginous externally, swollen, ventri- 

 cose in the middle, attenuated at both ends, often twisted, longitudi- 

 nally striato-sulcate, rufous or rufous-brown, rooted in a fusiform 

 manner at the base. Gills annulato-adnexed, soon separating, free, 

 broad, distant, firm, connected by veins, crisped, white then be- 

 coming somewhat of the same colour as the pileus, often spotted. 



