684 THE AGARICACEAE OF MICHIGAN 



times cavernous, subglabrous, even, white or tinged yellowish. 

 SPOEES oval to subspherical, 6-7x4-5.5 micr., white. CYSTIDIA 

 none. ODOK slight; TASTE bitterish to nauseous. 



Gregarious or subcaespitose. On the ground in oak and maple 

 woods. Ann Arbor, New Richmond. September-November. 



Frequent around Ann Arbor in the late fall. Usually this species 

 is more slender than T. equestrc. Its virgate pileus and white gills 

 distinguish it from that species. The color is quite variable; some- 

 times the pileus is a doll white with a few yellow stains, while the 

 other extreme, with the pilens almost entirely smoky-brown or 

 blackish on disk, is equally common. The disk of the pileus some- 

 times develops blackish iibrillose scales while normally it is gla- 

 brous. In any case there is usually some sign of the streaked con- 

 dition. Specimens have been found in which slight yellowish stains 

 appeared on the edge of the gills in the older specimens, but these 

 could not be referred to T. coryphaeum Fr. which species 

 is said to have yellow-edged gills. Peck remarks that the taste 

 is scarcely bitter. In our plants a bitterish-nauseous taste was 

 nearly always present. Tricholoma intermedium Pk. is said to be 

 halfway between T. equestre and T. sejunctum, and is distinguish- 

 ed by its crowded gills. It should be considered as a variety, since 

 it is doubtless an example of the extreme variation of T. sejunctum. 



719. Tricholoma portentosum Fr. (Edible) 



Syst. Myc, 1821. 



Illustrations: Hard, Mushrooms, Fig. 63, p. S7, 1908. 

 Michael, Fiihrer f. Pilzfreunde, Vol. IT, No. 93. 

 Teck, X. V. State Mns. Mem. 4, PL 45, Figs. 1-5, 1900 



(var. centrale Pk.) 

 Cooke, 111., PI. 54. 



(Jillet, Champignons de France, PI. 092. 

 Pries, Icones, PI. 24. 

 Ricken, Blatterpilze, PI. 89, Fig. 3. 



"PILEUS 6-12 cm. broad, convex-expanded, subumbonate, some- 

 I ink's irregular and repand, viscid, even, glabrous, generally fuli- 

 ginous, sometimes violet-tinged, lurid, virgate with innate 1 black 

 fibrils, margin always naked and thin. FLESH white, obsoletely 

 Lutescent, fragile. GILLS rounded behind, slightly adnexed, broad 

 lap to 2 cm. i, distant when mature, whitish at first, finally yellow- 



