152 AGARICINl. 



On oak trunks and on the ground. 



Solitary or coespitose- Stem rooting, 2-3 in. long, 1-2 lines thick. Pileus 

 umber, paler at the margin, 1 in. and more broad. 



428. Agaricus (Fsathyxa) fibrillosus. P. " Fibrillose 



Pi^athyra." 



Pileus sub-membranaceous, campanulato-conyex, then ex- 

 panded, slightly striate, at first fibrillose ; stem elongated, very 

 fragile, white, fibrilloso-squamose ; gills adnate, plane, very broad 

 behind, purplish-black. — Fr. Epicr.p. 232. Eng. Fl. Y.p. 113. 



On the ground, in woods. Rare. 



Pileus when moist livid, sub-striate ; when dry white, not striate, often 

 fibrilloso-squamose : stem 3 in. high, 2-3 lines thick, beset with villous fas- 

 ciculated scales. — Fries. 



429. Agaricus (Psathyra) urticaecola. Berk. ^- Br. "Nettle- 



root Psathyra." 



Pileus campanulate, margin striate ; stem fistulose, attenuated 

 upwards, flocculent from the first, white ; gills ventricose in 

 front, attenuated behind, white, then chocolate colour. — B. ^ 

 Br. A7in.N.H.no.91d. 



On nettle roots. Aug. King's Cliffe. 



Pileus 2 lines across, campanulate, flocculent, wLite ; margin at length 

 straight, striate; stem short, slender, attenuated upwards, flocculent, fis- 

 tulose, springing immediately from the matrix ; gills ventricose in front, at- 

 tenuated behind, adnexed, at first white, then of a rich, chocolate. — B. (bBr* 



430. Agaricus (Fsathyxa) pennatus. Fr. " Scaly Psathyra." 



Pileus submembranaceous, campanulate, obtuse, even, at first 

 clad with white scales, then naked ; stem villous, silvery, pul- 

 verulent above ; gills adnexed, crowded, broad, livid, then 

 brownish-black. — Fr. Epicr. p. 234. Sys. Myc. i.p. 297. B. ^ 

 Br. Ann. N.H. (1865), no. 1010. 



On naked soil in gardens. King's Cliffe, occasionally, but 

 never in any abundance. 



Stem 1-1| in. long, 1-2 lin. thick, equal, villous, at the apex sprinkled with 

 whitish meal, silvery. Pileus \ in. high and broad, at length expanded to 

 an inch in breadth, not striate, at first densely clothed with whitish scales, 

 at length naked. 



431. Agaricus (Psathyra) gossypinus. Fr. " Cottony 



Psathyra." 



Pileus submembranaceous, campanulate, then expanded, tomen- 

 tose, becoming smooth ; margin striate ; stemtomentose, whitish ; 



