X.VI'I i; \l. HIST0R1 SI i;\ I , 



Pleurotus ostreatus Fr. 



Pileus fleshy, soft, convex or slightly depressed behi 

 dimidiate, often cespitosely imbricated, moist, glabro 

 cinereous or brownish; flesh white 



Lamellae broad, decurrent, subdistant, anastomc 

 base, white or whitish. 



Stem when present, very short, Arm, lateral 

 strigose-hairy at the base. 



Pileus 5 to 10 cm. broad; spores oblong, white, 7.5 to L0 



Not common, but found occasionally throughout our d 

 chiefly after rains in autumn, on various deciduous ti 



A specimen found by Mr. Fred Wells, growing on I 

 americana, in his lawn at Wheaton, consisted of :i mass of imbri 

 cated pilei extending down a diseased crevice in the tree-trui 

 a distance of 3 dm. The individual pilei were 7 to 12 cm. broad, 

 conchate, tapering to stem-like bases, smoky-white in co 

 lamellae deeply and irregularly decurrent, the interspaci 

 reticulate toward the base. 



Pleurotus sapidus Kalch. 



Plant generally cespitose, pileus eccentric or lateral, rarel 

 sessile, irregular, convex or depressed on the disk, gla 

 variable in color, whitish, yellowish, grayish-brown, lilac-bi 

 or smoky-brown; flesh white. 



Lamellae rather broad, subdistant, decurrent, distinc 

 anastomosing at the base, whitish. 



Stem firm, solid, straight or curved, white or whiti 

 united at the base. 



Spores oblong, pale lilac, 9 to 11 x 4 to 5 //. Pileus 5 to 12 

 cm. broad; stem 2.5 to 6" cm. long. 6 to L6 nun. thick. 



Street, Wheaton, in sod where a streel tree bad ben 

 to the ground, the plants growing from the buried decaying 

 and roots. In dense, cespitose clusters, appearing for 

 successive seasons after heavy rains, from A^ugusl to 



Pleurotus mastrucatus Fr. 



Pileus mouse-gray, as if prickly with floccose, squar 

 of the same color, fleshy, when full grown obovate oi 

 shaped, soft, flaccid, margin involute but lobed when fu 

 or luxuriant; stratum of flesh double, the upper gelatinoui 

 mouse-fuscous 1 mm. thick, the lower a little thicker 



Lamellae at first connivent in an eccentric um 

 converging to the base of the pileus, broad, somewh 

 quaternate, whitish-gray. 



Big Woods, Evanston; September. Gammon. Jewell 

 Wheaton, November. 



Prof. Morgan notes of plants collected in Ohio, that 

 is "rough, with hairs and rigid points intermixed: 

 hairs or points blackish." The blackish points or scales 



