PLEUROTUS. 373 



bottom of the free portion of the stern ; spores oblong, 

 narrow, oblique, white tinged with purple. The whole plant 

 smells, when first gathered, strongly of tarragon. (B. & Br.). 



Pleurotus revolutus. Kickx. 



Pileus 47 in. across, flesh very thick near the stem, and 

 gradually attenuated to the very thin margin, firm, dry, 

 elastic ; convex then flattened and depressed in the centre, 

 margin incurved, glabrous, rather shining, colour at first 

 smoky-yellow, then lead or mouse-colour, centre darkest ; stem 

 lateral, about 1 in. long, up to 1 in, thick, whitish, glabrous 

 or downy, solid ; gills docurrent, rather narrow, distinct, 

 rather crowded, white, margin minutely toothed. 



Agaricus (Pleurotus) rcvolutm, Kickx, p. 158; Cke., Hdbk., 

 p. 105. 



On beech trunks. 



Far. anglicus, Size and habit of the typical form, but 

 differing in the margin of the pileus being only very slightly, 

 or not at all inciirved, and in the gills being pallid 

 ochraceous. 



Cke., Illustr., pi., 180. 



On trunks. 



Pleurotus salignus. Pers. 



Pileus 2-4 in. across, subdimidiate, horizontal, at length 

 depressed behind and strigose, margin entire, incurved, 

 pale yellow-brown or dusky ; stem always short, firm, more 

 or less downy ; gills horizontal, not distinctly decurrent, 

 1.12 lines broa,d, distinct behind, branched at the middle, 

 crowded, pale dingy -pallid, margin often broken, not 

 glandular. 



Agaricus salignus, Pers., Svn., p. 478; Cko., Hdbk., p. 105; 

 Cke., Illustr., pi. 228. 



On rotten trunks, especially willows. 



Not caespitose. Readily distinguished by the pileus being 

 pulvinate when young, then becoming depressed and strigose, 

 gills thinner and more crowded than usual in the genus, 

 somewhat branching, not anastomosing behind ; dingy 

 emoke-colour, as are also the spores. (Fries.) 



Pleurotus acerinus. Fr. 

 Pileus 14 in. across, somewhat circular, convex or almost 



