356 



THE AGARICACEAE OF MICHIGAN 



TUis species forms mycorhiza on the red oak ; the yellow mycelium 

 was fouud connecting the mushrooms and the rootlets of the tree 

 and on examination the latter were found to be ectotrophic my- 

 corhiza. Our plants depart somewhat from the descriptions of the 

 European G. elegantior, but the spores and color and other major 

 characters are the same. It may be considered as a variety until 

 more extensively collected. It differs from G. fulgens in its large 

 spores, the pallid color of the very young gills and stem and the 

 serrate edge of the gills. The color changes markedly to rusty 

 or fulvous as the plant becomes mature. The bulb is not as large 

 and depressed as in G. fulgens. In the European plant the color 

 shades slightly into olive, as in our G. elegantioides. 



341. Cortinarius corrugatus Pk. 



N. Y. State Mus. Kep. 24, 1872. 



Illustrations: N. Y. State Mus. Mem. 4, PL 58, Fig. 8-15, 1900. 



White, Conn. State Geol. & Nat. Hist. Surv., Bull. 15, PI. 21, 

 1910. 



I' ILEUS 5-10 cm. broad, broadly campanulate, obtuse, viscid 

 when moist, coarsely and radiately corrugate or reticulate, tawny 

 or yellowish-ferruginous, varying to yellow or ochraceous. FLESH 

 white, Hi in on margin. GILLS adnate, rather broad, close, trans- 

 versely striate, pallid or obscurely purplish-tinged at first, soon 

 ferruginous-cinnamon, edge eroded at length. STEM 7-12 cm. long, 

 6-16 nun. thick, long cylindrical, often fibrillose, spongy-stuffed, 

 often hollowed by grubs, scurfy at apex, yellowish or tawny-yellow, 

 with a rather small, rounded-oval ~bnlb which is clothed when fresh 

 by the I hin, lawny, adnate and viscid remains of a universal veil, 

 pallid or concolor within. CORTINA almost lacking, evanescent. 

 SPORES broadly elliptical, very rough-tuberculate, variable in size 

 L0-15x7-10 micr. (usually 12-13x8-9 micr.). BASIDIA clavate, 

 45-48 x 1l' micr., 4-spored- ODOR rather pleasant. TASTE mild. 



Gregarious or subcaespitose. On mossy or moist ground in low 

 or swampy, Iron. lose woods. Vicinity of Detroit; but probably 

 i aroughout the State. July-October. Not infrequent in appropriate 

 habitats. 



This is a curious species whose early button stage alone shows 

 its relation to the subgenus Bulbopodium. Later there is no margin 

 ooticeable on the bulb, and no sign of the early attachment of the 



