158 AGARICUS. 



Omphaiia. 340. A. muralis Sow. Pileus rufous-brown, somewhat mem- 

 branaceous, tough, convex, umbilicate, then infundibuliform, 

 radiato-striate, smooth, margin crenulate. Stem stuffed, curt, 

 smooth, of the same colour as the pileus. Gills decurrent, distant, 

 pallid. 



Intermediate between A. hepaticus and A. umbelliferus. The figure of 

 Sowerby differs from Fries in the pileus being even (with dryness?), in the stem 

 being thicker, and in the gills becoming dingy yellow. 



On turf walls, &c. Frequent. Feb.-Sept. 



Pileus 8 mm. -2.5 cent. (%-i in.) broad. Stem 6-12 mm. (%-K in-) long- 

 Name mnrus, a wall. From its habitat. Sow. t. 322. Fr. Hym. Eur. p. 



160. Alonogr. i. p. 186. Berk. Out. p. 131. C. Hbk. n. 219. Ilhist. PI. 

 250. S. lily co I. Scot. n. 199. 



341. A. umbelliferus Linn. Pileus about 12 mm. (y z in.) 

 broad, commonly whitish, slightly fleshy -membranaceous, convex 

 then plane, broadly obconic with the decurrent gills, not at all or 

 only slightly umbilicate, hygrophanous, when moist watery, rayed 

 with darker stritz, when dry even, changeable in appearance, 

 silky, flocculose, rarely squamulose, the margin, which is at Jirst 

 inflexed, crenate. Stem short, not exceeding 2.5 cent, (i in.) long, 

 almost 2 mm. (i lin.) thick, stuffed then soon fistulose, slightly 

 firm, equal or dilated towards the apex into the pileus, of the same 

 colour as the pileus, commonly smooth, but varying pubescent, 

 white villous at the base. Gills very broad behind, triangular, 

 decurrent, very distant, edge of the gills straight. 



The floccose texture of the pileus is thicker at the disc than in the rest of the 

 species of this section, hence the pileus is less membranaceous, and the um- 

 bilicus more obsolete. The gills vary dichotomous, &c. The colour is very 

 changeable, commonly whitish, shining whitish when dry; in Alpine regions 

 and on fir trunks bright light-yellow, the pileus when dry commonly whitish (A. 

 chrysoleucus Pers. ) ; about shady hedges and burnt places grey, with the stem 

 often velvety ; on rotten trunks of beech, and in some shady places dark 

 umber. There is a green variety. Fl. Dan. t. 1672. f. i. 



Boggy ground, rotten wood, &c. Common. April-Dec. 



Cosmopolitan. The common form is to be found everywhere from the sea- 

 level to 4000 feet. The green form, agreeing exactly with the ' Flora Danica 1 

 figure (t. 1672. /. i.), has been gathered in England (B. & Br. n. 1749). I 

 have gathered the form which corresponds exactly with A. chrysoleucus Pers. in 

 lower grounds, and the golden-yellow variety only at the higher altitudes, up 

 to 3500 feet. Var. abiegnus (B. & Br. n. 1413) pale yellow ; on very decayed 

 fir-stump. Spores 3x4 mk. W.G.S. ; 10x4 mk. IV. P. ; green var. 10x6 

 ink. W.P. Name umbella; fero, to bear; umbel-bearing. With umbel- 

 shaped pileus. Linn. Suec. n. 1192. Fr. Monogr. i. p. 187. Hym. Eur. p. 



161. Berk. Out. p. 132. C. Hbk. n. 220. Illust. PI. 271. S. Mycol. Scot. n. 

 200. A. niveus Fl. Dan. t. 1015. A. Hedw. fil. Obs. i. /. %.f. A. A. valgus 

 Holmsk. Ot. ii. /. 34. 



