112 AGARICUS. 



Collybia. 228. A. aquosus Bull. — Pileus watery, ochraceous or brick- 



colour then whitish, slightly fleshy, rather plane, obtuse, smooth, 

 hygrophanous, viargi?i striate. Stem fistulose naked, rufous-tawny, 

 fibrillose at the base. Gills 7-oiinded-f7'ee, crowded, narrow, tense 

 and straight, white or pallid. 



Among moss. Coed Coch, &c. Autumn. 



In ' Monographia ' the plant is described as A. aquosus Fr. and the plant of 

 Bulliard is referred to as a trivial form, holding a doubtful place between it 

 and A. dryophibis. This view is followed in ' Icones,' but has not been con- 

 firmed in ' Hym Eur.' The difference is scarcely appreciable, the stem being 

 described as stuffed, while in Bulliard's plant it is fistulose. Spores 5-6x3-4 

 mk. B. Name — aq7ia, water. From its watery nature. Bull. t. 12. Fr. 

 Hym. Eur. p. t'2'2. Monogr. \. p. 163. Icon. t. 66. f. 2. B. b' Br. n. 1340. 

 C. Illust. PL 234. 



229. A. extuberans Fr. — Pileus 2.5-5 cent. (1-2 in.) broad, 

 rufous- fuscous, bay -brown, occasionally becoming pale, but 

 not hygrophanous, slightly fleshy, convex then flattened, orbicu- 

 lar, and at length depressed round the prominent umbo, even, 

 smooth, slightly viscid when moist; flesh white. Stem 4 cent. 

 {lYz in.) long, 3 mm. (i^ lin.) thick, tough, fistulose, equal, tense 

 and straight, smooth, even, shining, of the same colour as the 

 pileus or paler, rooted at the base. Gills somewhat free, reach- 

 ing the stem with a small tooth, crowded, narrow, plane, white. 



The pileus is larger and solitary when growing on the ground, smaller when 

 csespitose and growing on trunks. Appearing in spring and again in autumn. 

 It is intermediate between A. dryophilus and A. ienacellus, clearly distinct 

 from the former in the stem being tense a?id straight and rooted, and in the 

 pileus being umbotiate, and from the latter in the gills being crowded and nar- 

 row. The umbo is rarely so prominent as in the figure of Battarra. 



On the ground and trunks. Foxley. Sept. 



Name — extuberans, swelling. From the swollen umbo. Fr. Motiogr. \. p. 

 164. Hyfn. Eur. p. 123. Ico?i. t. 6j.f. i. Grevillea, vol. viii. p. 74. Bulla 

 extuberans 5^/^. t. 2,^./. i. 



230. A. exsculptus Fr.— Pileus 2.5-5 cent. (1-2 in.) broad, 

 tawny-brown ?zot becouiiiig pale, slightly fleshy, tough, convexo- 

 expanded, truly umbilicate^ uncha7igeable, smooth. Stem short, 

 2.5 cent, (i in.) Xoxvg, fistulose, thin, incurved, smooth, bright S7il- 

 phur-yellow. Gills somewhat free (decurrent with a small tooth), 

 arcuate, linear, very crowded, bright sulphur-yellow. 



Gregarious. Allied to the protean A. dryophilus, but separated from it on 

 account of its being wholly more arid and tough, and on account of the bright 

 sulphur-yellow of the whole plant with exception of the pileus which is darker. 



On old stumps and in fir woods. Uncommon. June-Oct. 



