874 ruxGrs-FLOKA. 



plane ; flesli thick at the disc, Ijecomiiig thin elsewhere, white ; 

 silkil}' 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., i^L 291? 



On trunk. 



Caespitose or solitary: not hygrophanous. Cooke's figure 

 differs from the description given by Fries in having the 

 pileus tinged with bro-wn, and the stem robust, 1 in. long, 

 and above -I in. thick. 



II. JJIMIDIATI. 



Pleurotus petaloides. Bull. 



Pileus 1-2 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 h in. long, sometimes very short, 

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

 spores 9-10 x -t fj- 



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

 Illustr., pi. 258a. 



Agaricus petaloides, Bull., Champ., 22G, 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 refiexed, 

 small, almost indicating a transition to P. tremulus. 



Pleurotus serotinus. Schrad. 

 Pileus l-o in. broad, flesh thick, at first convex and 

 gibbous, then plane and ascending, reniform or obovate, 

 even, glabrous, covered with a viscid 2:)ellicle in wet weather, 

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

 then expanded and rather wavy ; gills not truly decurrent. 



