48 AGAEICINI. 



117. Agaricus (Pleurotus) circinatus. Fr. " Circinate 



Pleurotus." 



Pileus fleshy, convexo-plane, obtuse, orbicular, glistening, 

 slightly silky, becoming whitish ; stem stuffed, elastic, short, 

 equal, smooth, rooting; gills adnate fsub-decurrent), crowded, 

 white. — Fr.Ejncr.p.ld^. Secr.no. G70. 



On rotten wood. W, W. Saunders, Esq. 



Solitary, beautifully regular, sub-central, tougb, wholly white, not hygro- 

 phanous, odour faint, not mealy ; stem 1-2 in. long, 3-4 lines thiick ; pileus 

 about Sin. broad. 



118. Agaricus (Pleurotus) ostreatus. Jacq. " Oyster 



Pleurotus." 



Pileus soft, fleshy, sub-dimidiate, conchate, ascending, growing 

 pale; stem abbreviated (or obsolete), firm, elastic, strigose at the 

 base; gills decurrent, rather distant, anastomosing behind, whitish. 

 — Fr.Epicr.p. 133. Huss.ii.t. 19. Sow. t. 241. Letell. t. 695. Vitt. 

 Mang.t.4:. Lenz.f.ld. Vent. 1. 17, f. 3-4, 1. 18. Kromhh.t.41, f. 

 1-7. Tratt. essb. Sch. t. 0. Tratt. Austr. t. 40. Cooke, B.F. t. 8. 

 Smith, E.M.f. 17. Jacq. Austr. t. 288. Eng. Fl. v. p. 71. Badh. i. 

 t. 2, ii. 1. 10. Hogg. ^ Johnst. t. 21. 



On trees, especially laburnum. Autumn and winter. Escu- 

 lent. [United States.] 



Imbricated, large; pileus sub-dimidiate, very thick and fleshy, flesh, white, 

 dusky towards the surface, lin. deep the border at first fibrillose, orsquamu- 

 lose, margin involute ; as the pileus expands the white fibrillse vanish, and 

 the colour changes from dusky to bistre ; margin paler and rimulose, the 

 whole surface shining and satiny when dry, soft and clammy when moist, 

 towards the base in age there is a little white down ; gills broad, here and 

 there forked, anastomosing at the base, dirty white, the edge serrated, umber. 

 In large specimens there is often a distinct stem, clothed with a dense short 

 white do^vn, which runs up between the gills; when dry the pileus becomes 

 pallid or yellowish.— J/. /. £. Spores -0003 X -00015 in. 



119. Agaricus (Pleurotus) salignus. Fr. "Willow Pleurotus." 



Pileus compact or spongiose, sub -dimidiate, horizontal, at first 

 pulvinate, even, then with the disc depressed, sub-strigose ; stem 

 short, white, tomentose ; gills decurrent, somewhat branched, 

 eroded, distinct at the base, nearly ctf the same colour. — Fr. Epicr. 

 ;?. 133. Letell. t. 687. Tratt. Austr. t. 4,/. 8. Paul. t. 22, Eiig.Fl. 

 Y.p.72. 



On trunks of trees. Oct. — Jan. [United States.] 



Pileus convex. 4-6 in. broad, stem excentricor lateral, sometimes obsolete; 

 fuli|_'inou?. white, or ochraceous, according to its stage of growth. - i^rte*. 

 Spores -00036 X -00015 in.— IF.&./S'. 



