56 THE A.GARICACEAE OF MICHIGAN 



The densely tufted furrowed stems and irregular one-sided vase; 

 shaped pilei distinguish this at once. Often there are many short 

 undeveloped pilei around the base of large tufts. The plant is rare 

 in some localities, and in others it may be very plentiful. 



Section II. Pleuroti. Stem lateral or none. Pileus dimidiate. 



24. Lentinus vulpinus Fr. 



Epicrisis, 1836. 



Illustrations : Atkinson, Mushrooms, Figs. 128, 129, p. 134-5, 1900. 

 Hard, Mushrooms, Plate 26, Fig. 181, p. 227, 1908. 

 Fries, Icones, Plate 176. 



PILEUS 5-15 cm. broad, sessile, multiple-imbricated, conchate-. 

 reniform, joined at their bases, coarsely hairy or scrupose, radiately 

 rough ribbed, flesh color to alutaceous, margin strongly incurved. 

 FLESH rather thin, tough-fleshy, whitish. GILLS decurrent, broad 

 toward front, narrowed, to the base of the pileus, crowded, simple 

 white or tinged flesh color, edge coarsely serrate. SPOKES sub- 

 globose, 3-4 x 2-3 micr., very minute, smooth, white in mass, copiously 

 shed on the pilei. ODOR and TASTE rather strong, pungent. 



Densely connate-imbricate. On decaying logs, stumps and trunks 

 of various deciduous trees. Ann Arbor, Detroit, New Richmond, 

 Houghton, Marquette. Records from July 25-Oct. 19. Infrequent. 



It reappears on the same log in successive years. The very rough 

 and peculiarly colored pileus is not easily mistaken. It grows in 

 shelving masses of many individuals, almost equalling Plewrotus 

 ostreatus in this respect, and is by far the largest of the dimidiate 

 species of the genus. 



25. Lentinus ursinus Fr. — Bres. 

 Syst. Myc, 1821. (As Pleurotus.)) 

 Illustration: Bresadola, Fung. Trid., Vol. 1, PI. 66. 



PILEUS 1-4 cm. broad, sessile, ascending, subimbricate, subreni- 

 forni, convex, pule reddish-brown, varying glabrous to sub-tomen- 

 tose, even, fading. FLESH thickish, very thin on margin, tough- 

 ish. GILLS subdecurrent or radiating from the stem-like base. 

 rather broad, close, dingy white to whitish-alutaceous, edge lacerate- 

 dentate. SPORES spheroid, -.5.5 x 4 micr., almost smooth, white. 



