LEUCOSPORI. 171 



ing on wood. Fr. Monogr. i. f. 243, Hytn. Eur. p. 169. B. Gf Br. n. 996. Pleurotus. 

 C. Hbk. n. 116. Illust. PI. 257. a. S. Mycol. Scot. Supp. Scot. Nat. 1885, 

 p. 22. Saiind. &= Sm. t. 6.f. 2, Fl. Dan. t. 1797. Ag. Marklini T7-att. 

 Austr. t. 28. 



369. A. circinatus Fr. Wholly white, not hygrophanous. — 

 Pileus about 7.5 cent. (3 in.) broad, orbicular, horizontal, fleshy, 

 tough, convex then piano-disc-shaped, obtuse, even, but covered 

 over with a shining whitish slightly silky lustre. Stem 2.5-5 

 cent. (1-2 in.) long, 6-8 mm. (3-4 lin.) thick, sticffed, elastic, equal, 

 central or slightly excentric, commonly straight, smooth, bluntly- 

 rooted at the base. Gills adnate, slightly decurrent, crowded, 

 broad (as much as 6 mm., 3 lin.), white. 



An exceedingly distinct species. Regular, solitary, with a weak, pleasant, 

 not mealy odour. The pileus is a little thicker than that of A. lignatilis, but 

 less compact ; the gills are twice as broad. As A. lignatilis is changeable, 

 this is always constant in form. 



On rotting birch stump. Rare. Oct. 



Name — circino, to make round with compasses. From its very regular or- 

 bicular shape. Fr. Monogr. \. p. 244. Hy?n. Eur. p. 170. Icon. t. 88./. i. 

 B. 6^ Br. 71. 1220. C. Hbk. n. 117. Illust. PL 257. b. 



*** Veil no7iej gills deeply decurrent j stem distinct, &^c. 



370. A. pantoleucus Fr. Wholly white. — Pileus as much as 

 7.5 cent. (3 in.) long, about 5 cent. (2 in.) broad, fleshy, excentric, 

 dimidiate, spathulate and slightly convex, ev^en, smooth, some- 

 what depressed and marginate behind ; margin equal, entire. 

 Stem 2.5 cent, (i in.) or a little more long, 12 mm. {}i in.) and 

 more thick, solid, asce?tdi?tg, very excentric, equal or attenuated 

 downwards, Jiot rooted, even, smooth. Gills decurrent, somewhat 

 crowded, simple, separate at the base. 



The disc of the pileus is often opaque. Solitary, firm. There is a smaller 

 form with the pileus more regular and somewhat umbilicate. 



On trunks, willow, &c. Coed Coch, 1881. Oct. 



Spores 8-10x3-4 mk. W.P. Name — iras, all; Aevxos, white. Fr. Hym. 

 Eur. p. 172. Icon. t. 88./ 2. B. &f Br. n. 1932. C. Illust. PI. i-jg, 275. 

 A. spodoleucus albus Fr. Monogr. i. p. 246, 473. 



371. A. mutilus Fr. Wholly white. — Pileus very excentric or 

 wholly lateral, slightly Jleshy, soft, tough, reniform, spathulate, (Sic, 

 depressed behind, somewhat umbilicate, otherwise ascending, 

 silky whe7t dry, becoming smooth. Stem 6-8 mm. (3-4 lin.) and 

 more long, 2-4 mm. (1-2 lin.) thick, erect or ascending, excentric 

 or somewhat lateral, roimd, solid, tough, smooth except at the 



