446 PLEUROTUS 



var. columbinus (Quel.) Cke. (= Pleurotus columbinus Quel.) Bres. 

 Fung. Trid. t. 6, as Pleurotus columbinus Bres. 



Columbinus, pertaining to a pigeon. 



Differs from the type in the dark bluish grey pileus, and glaucous 

 gills. Edible. On stumps. Feb. Sept. Not uncommon, (v.v.) 



1448. P. revolutus Kickx. Revolutus, rolled back. 

 P. 9-15 cm., at first smoky, then lead and mouse colours, disc darker, 



firm, elastic, convexo-plane, depressed behind, shining; margin in- 

 curved. St. 2-5 x 2-3 cm., whitish, sometimes pubescent. Gills white, 

 decurrent, serrulated. On old trunks, poplar, beech. Sept. Oct. 

 Rare. 



var. anglicus Massee. Cke. Illus. no. 281, 1. 180, as Pleurotus revolutus 



Kickx. Anglicus, English. 



Differs from the type in the margin of the pileus being only very 



slightly, or not at all incurved, and in its pallid ochraceous gills. On 



trunks. Rare. 



1449. P. salignus (Pers.) Fr. Cke. Illus. no. 282, t. 228. 



Salignus, belonging to willow. 



P. 58 cm., fuliginous-cinereous, or ochraceous, compact, spongy, 

 subdimidiate, horizontal, at first pulvinate, at length depressed behind, 

 here and there strigose. St. 1-1-5 x 3-4 cm., tan, firm, more or less 

 tomentose. Gills dingy-fuliginous, horizontal, branched in the middle, 

 crowded, edge often eroded. Spores dingy, "oblong cylindrical, often 

 curved, 8-14 x 3-4-5/x, 1-guttulate" Karst. On willow, and alder 

 trunks. Sept. Jan. Uncommon. 



1450. P. acerinus Fr. Acerinus, belonging to maple. 

 Entirely shining white, tough. P. 2-5-10 cm., thin, unequal, silky- 



villose. St. 1x1 cm., often obsolete, somewhat lateral, whitish, 

 villose. Gills white, becoming yellow, decurrent, crowded, thin. Spores 

 white, elliptical, 6 x 3p, or 6-7 x 4-5/u,, 1-2-guttulate. On trunks, 

 and logs of maple, ash, and hornbeam. Sept. Oct. Uncommon. 

 (v.v.) 



II. Pileus definitely lateral, immarginate behind, not 

 resupinate at first. 



1451. P. petaloides (Bull.) Fr. Bull. Hist. Champ. Fr. t. 226. 



7TTa\,ov, a leaf; etSo?, like. 



P. 2-5-5 cm., fuscous, becoming pale, dimidiate, somewhat spathulate, 

 continuous with the stem', margin at first involute, then expanded. 

 St. 1-5-2-5 x 1-5-2-5 cm., sometimes very short, whitish, firm, com- 

 pressed, channelled when larger, villose. Gills white, or yellowish, then 

 cinereous, decurrent, very crowded, very narrow, very unequal. Flesh 



