,,,,,, THE AGARICACEAE OF MICHIGAN 



703. Pleurotus lignatilis Fr. (Edible) 



Syst. Myc, 1821. 



Illustrations: Cooke, 111., PI. 257. 



Hard, Mushrooms, Fig. 126, p. 163 (as P. abscondens). 

 Gillet, Champignons de France, No. 538. 

 Plate CXLIII of this Report. 



PILEUS 2-5 cm. broad, tough, irregular, convex, sometimes de- 

 pressed or umbilicate, flocculose-pruinose, then glabrous, whitish. 

 GILLS adnato-decurrent, crowded, narrow, white. STEM 2-4 cm. 

 long, 2-4 mm. thick, slender, stuffed then hollow, equal, irregular- 

 curved, eccentric, somewhat villose. SPORES minute, oval, 3-5 x 

 2-3 micr., smooth, white. ODOR markedly farinaceous. 



Gregarious on logs, etc. Bay View. August-September. Infre- 

 quent. 



Var. abscondens Pk. has gills truly adnate becoming emarginate; 

 spores elliptical. 4-5 micr. long. 



The plants referred here agree with the figures of European au- 

 thors in having the gills acuminate-adnate on the stem, so that as 

 the pileus expands they appear subdecurrent. This is also true 

 of the following two species. On account of this characteristic, 

 it seems to me these three species had better be grouped under our 

 second section than with P. ulmarius, where Fries and all others 

 have placed them. P. lignatilis and P. circinatus and P. fimbriatus 

 var. are very much alike in general appearance. To distinguish 

 the species one has to rely on the farinaceous odor of P. lignatilis, 

 on the subsolid stem and peculiarly hygrophanous pileus of P. 

 fimbriatus var., and on the very regular cap of P. circinatus. The 

 spores in all three are minute and somewhat alike. The pileus of 

 P. lignatilis often tends to be subinfundibuliform. 



704. Pleurotus circinatus Fr. (Edible) 

 Epicrisis, L836-38. 



Illustrations: Fries. Icones, Plate 88. 

 ( % <><>kc. 111., pi. 257. 



PILE1 S 2-5 cm. broad, or less, regular, tough, convex, then plane 

 and slightly depressed, irhite or whitish, silky pruinate. FLESH 



