374 FUNGUS-FLORA. 



plane ; flesh thick at the disc, becoming thin elsewhere, white ; 

 silkily downy, shining white; stem very excentric, almost 

 lateral, slender or almost obsolete, downy; gills decurrent, 

 very much crowded, thin, white then yellowish. 



Agaricus (Pleurotus) acerinus, Fries, Epicr., p. 134; Cke., 

 Hdb'k., p. 106; Cke., Illustr., pi. 291? 



On trunk. 



Caespitose or solitary ; not hygrophanous. Cooke's figure 

 differs from the description given by Fries in having the 

 pileus tinged with brown, and the stem robust, 1 in. long, 

 and above 7V in. thick. 



II. DIMIDIATL 



Pleurotus petaloides. Bull. 



Pileus 12 in. long, flesh thin ; ascending, somewhat 

 obovate or spathulate, almost plane, depressed behind and 

 running into the stem where it is downy, remainder gla- 

 brous, brownish, becoming pale, margin at first involute, 

 then expanded ; gills decurrent, very much crowded, about 

 1 line broad, linear, and very unequal, whitish then grey ; 

 stem solid, firm, about |- in. long, sometimes very short, 

 compressed, more or less downy, exactly lateral, whitish ; 

 spores 9-10 x 4 p.. 



Agaricus (Pleurotus) petaloides, Cke., Ildbk., p. 106 ; Cke., 

 Illustr., pi. 258A. 



Agaricus petaloides, Bull., Champ., 226, f. 2. 



On trunks. 



Gregarious or imbricated, pileus entire, stem channelled in 

 large specimens ; colour of pileus various ; taste bitter. 

 Fries mentions a form growing on the ground in grassy 

 places, having the pileus somewhat vertical, margin reflexed, 

 small, almost indicating a transition to P. tremulus. 



Pleurotus serotinus. Schrad. 



Pileus 13 in. broad, flesh thick, at first convex and 

 gibbous, then plane and ascending, reniform or obovate, 

 even, glabrous, covered with a viscid pellicle in wet weather, 

 yellowish-green, sooty-olive, &c. ; margin at first involute, 

 then expanded and rather wavy ; gills not truly decurrent, 



