LEUCOSPORI. 177 



On the naked trunk of a laurel. Coed Coch, 1879. Oct. Pieurotus. 



Spores ovate, .0008 millim. long. B. 6^ Br.; 8x11 mk. W.P. Name — 

 Laurus cerasus, cherry-laurel. B. 6^ Br. n. 1854. C, Illust. PI. 242. a. 



385. A. tremulus Schasff. — Pileus about 12 mm. {Yz in.) broad, 

 fuscous-grey, becoming pale, hygrophanous, slightly fleshy, dimidi- 

 ate, somewhat horizontal, renifonn, plane, depressed and often 

 villous behind, otherwise smooth, even. Stem 12 mm. {yi in.) 

 long, sometimes very short, distinct, exactly lateral, ascending- 

 vertical, round, somewhat thin (4 mm., 2 lin.) and dilated tipwards, 

 grey. Gills adnate, or, when the pileus is more evidently de- 

 pressed, decurrent, but determinate, linear, narrow, somewhat 

 dista7it, very unequal, grey. 



Stem fixed to mosses by fibrils at the base. Changeable like neighbouring 

 species. The whole plant stiff. Solitary. There is a remarkable form with 

 the stem slender, 2.5 cent, (i in.) and more long, 2 mm. (i lin.) thick, wholly 

 rounded, with the thinner diaphanous pileus 2.5-5 cent. (1-2 in.) broad, here 

 and there infundibuliform, fringed with lobes all round, and with the gills in 

 no wise decurrent. 



On the ground, moss, fungi, &c. Rare. Aug.-Dec. 



Stem attached to the matrix by a woolly mass. M.jf.B. Name — tremulus, 

 tremulous. Schceff. t. 22^ (but/, i, 2 with the stem channelled incline to A. 

 petaloides). Fr. Monogr. i. p. 250. Hym. Eur. -p. 177. Berk. Out. p. 137. 

 C. Hbk. 71. 123. Illust. PL 242. S. Mycol. Scot. n. 220. Sow. t. 242. 



386. A. acerosus Fr. — Pileus grey, silky-white when dry, 

 membranaceous, reniform, plane, striate, somewhat lobed. Stem 

 very short or obsolete, lateral, somewhat strigose at the base. 

 Gills determinate, linear, crowded, single, grey. 



So protean that it is necessary to describe the primary forms separately : A. 

 YA^\ grey, silky-white zvhen dry, mevibranaceous, st?-iate when damp. Stem 

 short, 6 mm. (3 hn.) long, round, strigoso-hispid, as if composed of many to- 

 gether, bearing many small pilei which resemble a lobed pileus 2,5-5 cent. 

 (1-2 in.) broad. Gills horizontal, determinate, xvoX. ^Q.c\xxxQ.Xi\, scarcely some- 

 what distant, of the same colour as the pileus. B. Pileus membranaceous, 

 plane, reniform or orbicular, most frequently lobed, flaccid, when fresh striate 

 and grey. Stem scarcely 2 mm. (i lin.) long and broad, lateral, compressed, 

 villous. Gills linear, very narrow, crowded, many unequal, grey. C. Pileus 

 fuscous when moist, hoary when dry, membranaceous, flaccid, reniform, 

 wholly horizontal, depressed behind and strigose at the disc, slightly striate 

 at the margin, undulated, fringed all round when larger. Stem lateral, very 

 short or almost none. Gills decurrent, not very crowded, scarcely 2 mm. 

 (i lin.) broad, fuscous-cinereous, not becoming pale like the former. D. 

 Horizontal, somewhat sessile with the pileus in a white tomentose mycelium 

 which is effused on mosses, wedge-shaped, wholly glaucous when fresh, fulig- 

 inous-fuscous when dry, soft and flaccid, scarcely striate, and only adhering 

 behind to a point, villous. Gills simple, thin, plane, linear. A on fallen fir- 

 twigs in dense woods. B on rotten wood of Pinus silvcstris in moist places. 

 C on pine-needles, by gravelly waysides. Bolt. t. ']'2. f. 3 as regards form, 

 D on Sphag7ia in hilly swamps, not to be confounded with Ca?itharcllus 



M 



