CLASSIFICATION' OP AGARICS 



This species does do1 seem to be verj well known. Onlj a fe* 

 specimens were found whicb are here considered to be identical with 

 Peck's variety. 



537. Pluteolus expansus I'k. 



N. Y. State Rep. 26, L874 (as Oalera expansus). 

 I llustration : Plate XI '\ I ! I of tliis Report. 



PILEUS 3-6 cm. broad, fragile, oval a1 first, then expanded 

 plane, not umbonate, slightly depressed in centre, viscid when moist, 

 cinereous-ochraceous tinged with brownish or greenish hnes, margin 

 at first Bnlphur-yellow, striate-sulcate or plicatulate. FLESB thin, 

 submembranaceous. GILLS \'v^' or slightly and narrowly adnexed, 

 narrow, close t<> crowded, a1 firsl white, soon ochraceous-cinnamon, 

 edge minutely flocculose. STEM 5-10 cm. long, 2-6 mm. thick, 

 fragilej equal or slightly tapering upward, hollow, sometimes com 

 pressed, splitting longitudinally, pruinose or floccose, citron-yellow, 

 yellow within except the evanescent pith. SPORES elliptical, 

 smooth, 10-12x7.5 micr., ochraceous-cinnamon under microscope. 

 Hymenium composed of large, inflated subglobose sterile cells inter- 

 mingled with basidia which are narrow below, inflated above and 

 1 spored. 



Gregarious or solitary. On rich manured lawns, fields, etc., 

 sometimes on dung; sometimes in woods. Ann Arbor, Houghton, 

 etc. Throughout the State. May-July. Infrequent. 



This speeies seems lo differ t'i'oiii Bolbitius vitellinus mainly in 

 the absence <»t' the yellow umbo or a yellow centre in the expanded 



pilens. in the constant yellow stem and the somewhat different dis 



tribution of color on the cap. It was firsl described bj Peck from 



specimens on decaying w I, bu1 later he reported U from "rich 



ground." The microscopic structure is very similar to thai ol 

 Bolbitius vitellinus. The gills, although rather soft, do nol dissolve 

 as in a typical Bolbitius, bu1 are fairlj persistent. Var. terrestris 

 Pk. is hen- made an integral pari of the species. 



