PLEUROTUS. 369 



Hist, no. 1754; Cke., Hdbk., p. 103; Cke., Illustr., pi. 178o, 

 and 654. 



On sawdust. 



Distinguished from P. pantoleucus by the gills being de- 

 terminate (ending definitely and not decurrent), and anasto- 

 mosing behind. 



Pleurotus lignatilis. Fr. 



Pileus 2-6 in. across, rarely central, usually more or less 

 excentric, sometimes quite lateral, often reniform, flesh thin 

 but compact and tough, cracking, convex then plane, obtuse 

 and often umbilicate, flocculosely mealy, becoming naked 

 after rain, wavy, margin at first involute, then expanded, 

 undulately lobed in luxuriant specimens, dingy white ; gills 

 adnate, much crowded, narrow, unequal, diverging in the 

 lobes, white ; stem stuffed then hollow, sometimes 23 in. 

 long, sometimes only 3-4 lines long, or almost absent, always 

 slender, unequal, curved or flexuous, tough and flexible, 

 whitish, villosely pruinose everywhere, base rooting and 

 rather downy. 



Agaricus (Pleurotus') lignatilis, Pries, Epicr., p. 132; Cke., 

 Hdbk., p. lOt; Cke., Illustr., pi. 257u. 



On trunks, rotten wood, &c. 



Very variable, form altogether inconstant, substance thin, 

 tough, smell strong of meal, dingy whitish ; usually densely 

 caespitose, but also solitary. (Fries.) 



Pleurotus circinatus. Fr. 



Entirely white. Pileus about 3 in. across, orbicular, hori- 

 zontal, flesh rather thick, pliant, convex then flattened and 

 more or less discoid, even, but covered with a whitish silki- 

 ness ; gills slightly decurrent, crowded, up to 3 lines broad ; 

 stem 1-2 in. long, 3-4 lines thick, equal, central or slightly 

 excentric, commonly straight, glabrous, base rooting, stuffed; 

 elastic. 



Agaricus (Pleurotus') circinatus, Fries, Epicr., p. 132; Cke., 

 Hdbk., p. 104 ; Cke., Illustr., pi. 257B. 



On rotten wood of birch, &c. 



Regular, solitary, entirely white, not hygrophanous, odour 

 weak but pleasant. Appears to approach Agaricus (Clito- 

 cybe) rivulosus, from which it is distinguished by its habitat. 

 (Fries.) 



VOL. II. 2 B 



