442 PLEUROTUS 



1434. P. dryinus (Pers.) Fr. (= Pkurotus dimidiatus (Schaefi.) Sacc.; 

 Pleurotus corticatus Fr. sec. Quel.) Cke. Illus. no. 269, t. 226. 



Spv'ivos, oaken. 



P. 5-10 cm., whitish, variegated with spot-like scales, which become 

 fuscous, lateral, oblique, rather plane. St. 2-5-4 x 1-3 cm., white, 

 sublateral, somewhat woody, squamulose, with a short, blunt root. 

 Ring scarcely apparent on the St., but appendiculate round the margin 

 of the p. when young. Gills white, becoming yellow when old, not very 

 decurrent, simple, narrow. Flesh white, thick, firm. Spores white, 

 oblong, cylindrical, 12-13 x 3-4/>i, 1-3-guttulate. Taste pleasant, 

 like mushrooms. Edible. On oaks, ash, willow, and walnut. Sept. 

 Feb. Not uncommon, (v.v.) 



1435. P. spongiosus Fr. Spongiosus, spongy. 

 P. 5-18 cm., at first whitish, tomentose with persisted, cinereous down, 



then becoming brownish and fibrillose with age, excentric, somewhat 

 lateral, pulvinate; margin paler. St. 1-3 x 14 cm., white, becoming 

 greyish, very excentric, incurved, tomentose, base abrupt. Ring white, 

 soon torn, appendiculate at the margin of the p., fugacious. Gills 

 whitish, becoming beautifully yellow when old and dried, 3 mm. broad 

 on one side of the st., 20 mm. wide on the other, sinuato-adnexed, 

 crowded. Flesh spongy, greyish marbled in the p., tinged yellowish in 

 the st. Spores white, oblong, cylindrical, rounded, or sometimes 

 pointed at one end, 12-14 x 4/z, 1-2-guttulate. On rotten beech, 

 and mossy trunks. Oct. Nov. Rare, (v.v.) 



B. Veil none; gills sinuate, or obtusely adnate. 



1436. P. ulmarius (Bull.) Fr. Cke. Illus. no. 271, t. 227. 



Ulmarius, belonging to elm. 



P. 6-20 cm., ochraceous becoming pale-livid, often marbled with 

 round spots, convex, then plane, disc-shaped, compact, horizontal, 

 often cracked in a tesselated manner, smooth. St. 5-11 x 1-5-4 cm., 

 white, becoming tinged with yellow, firm, elastic, subexcentric, curved, 

 ascending, base somewhat fusiform, or thickened and tomentose, often 

 villose throughout. Gills pale ochraceous, or whitish emarginate, broad, 

 somewhat crowded. Flesh white, tough. Spores white, globose, 5-6/x. 

 Smell pleasant, or somewhat acid, taste pleasant. Edible. On trunks, 

 especially elm. June Dec. Common, (v.v.) 



1437. P. tessulatus (Bull.) Fr. Bull. Hist. Champ. Fr. t. 513, fig. 1. 



Tesselatus, checkered. 



P. 510 cm., grey, becoming pale tawny, convex, then plane, and 

 in a form somewhat lateral, depressed behind, irregular, horizontal, 

 variegated with round and hexagonal spots. St. 2-3 x 1-5 cm., white, 

 compact, equal, or attenuated at the base, very excentric, curved- 

 ascending, smooth. Gills white, or becoming yellow, sinuate behind, 



