146 AGARICUS. 



Mycena. old ; it varies whitish, with the papilla fuscous. The stem is elongated and 

 filiform among the taller mosses. 



In fir woods, &c., among moss. Common. July-Nov. 



Spores ellipsoid, 3~4X2mk. K.; ioX4mk. IV. P. Name vulgaris, com- 

 mon. Pers. Syn. p. 394. Ic. pict. t. 19. /. 3. Fr. Monogr. i. p. 228. Hym. 

 Eur. p. 150. Berk. Out. p. 128. /. 6./. 4. C. Hbk. n. 203. Illust. PL 191. 

 b. S. Mycol. Scot. n. 182. Qucl. t. 4. f. 7. Fl. Dan. t. 1678. f. 2 (incorrect). 



309. A. citrinellus Pers. Pileus 4-6 mm. (2-3 lin.) broad, 

 lemon-yellow, but often darker at the disc, membranaceous, cam- 

 panulate then hemispherical and flattened, but not umbilicato- 

 depressed, striate, scarcely viscous. Stem 2.5 cent, (i in.) long, 

 fistulose, _/?/z/2>r;;z, smooth, viscid in wet weather at least, lemon- 

 yellow, villous at the base, but scarcely rooting. Gills uncinate, 

 alternate, distant, moderately broad, shining white. 



Pileus becoming pale. Gregarious ; smaller and less viscid than A. vul- 

 garis. Var. Candida, sulphur-yellow when dry. 



In pine woods, &c. Uncommon. Oct. 



Persoon's plant grows on the ground. The form described by Fries in 

 ' Icones ' is smaller and grows on wood. Spores 7x8 mk. W.G.S. Name 

 citrus, lemon. Lemon-yellow. Pers. Ic. t. \~i.f. 3. Fr. Monogr. \. p. 229. 

 Hym. Eur. p. 150. Icon. t. 84. f. 4. B. & Br. n. 1215. C. Hbk. n. 204. 

 Illust. PL 248. Fl. Dan. t. 1614.7. * Batschf. 88. 



310. A. plicato-crenatus Fr. Pileus 6 mm. (3 lin.) broad, but 

 higher, white then becoming light yellow, very thin, conical, 

 somewhat umbonate, remarkably sulcato-plicate and crenate, with- 

 out a separable pellicle. Stem 4 cent. (\% in.) long, filiform, 

 obsoletely or scarcely fistulose from its thinness, pallid reddish, 

 internally becoming light yellow, smooth, viscid. Gills ascend- 

 ing, narrow and attenuated behind, adnate, with a small decur- 

 rent tooth, distant, white. 



Allied to the very protean A. epipterygius, but thinner, so that the pileus is 

 deeply plicate like that of Marasmius rotula, and the margin remarkably cre- 

 nate. In its very thin plicato-crenate pileus it approaches A. roridus. 



Among heath. Coed Coch, 1878. Oct. 



Name //zVrt, a fold ; crena, a notch. Plicate and crenate. Fr. Monogr. 

 ii. /. 294. Hym. Eur. p. 150. Icon. t. 84. /. 2. B. & Br. n. 1748. C. Illust. 

 PL 248. b. 



311. A. roridus Fr. Wholly shining white, but varying with 

 the pileus becoming yellow. Pileus 4-6 mm. (2-3 lin.) broad, 

 very thin, membranaceous, conico-campanulate then convex, dry, 

 sulcate when moist, becoming even when dry. Stem 1-2.5 cent. 

 -i in.) and more long, obsoletely fistulose on account of its 



