:;;; THE AGARICACEAE OF MICHIGAN 



Caespitose. On the ground in oak woods. Ann Arbor. October. 

 Infrequent. 



Known by its whitish stem, hoary silkiness on the pale chestnut- 

 brown ground-color of tbe moist cap, the stuffed to hollow stem and 

 its medium size. The stem and cap become firm and rather rigid 

 when dry. When the stem tapers down it approaches C. rigens Fr. 

 but the incurved margin of the convex pileus, its hoary-silkiness 

 and more manifest cortina separate it. G. scandeus Fr. is distin- 

 guished by its smaller spores, conic to umbonate pileus and more 

 slender stem. G. leucopus Fr. has a conic to umbonate pileus and 

 different spores. 



***8tem and gills becoming brown or fuscescent. 



451. Cortinarius rubricosus Fr. var. 

 Epicrisis, 1836-38. 



PILEUS 3-7 cm. broad, convex-campanulate, broadly umbonate, 

 fuscous-bay-brown, subhygrophanous, margin grayish, white-silky, 

 at first incurved, elsewhere glabrous, even. FLESH thickish on 

 disk, watery to pallid. GILLS adnexed-emarginate, rather narrow, 

 close to subdistant, soon umber-brown, pallid-brownish at first, edge 

 wkite-fimbriate. STEM 3-5 cm. long, 8-12 mm. thick above, rather 

 stout, clavate-bulbous, 12-18 mm. thick toward base, firm, solid, 

 grayish-pallid, soon fuscescent, at length dark fuscous umber below 

 and within, at first densely white-fibrillose from cortina. SPOKES 

 broadly elliptical, rough-tuberculate, 8-10 x 6-7 micr. BASIDIA 

 40-45 x 9 micr., often with dark brownish content ; sterile cells on 

 edge of gills, slender, subclavate above. 



Solitary or gregarious. On the ground among humus in hem- 

 lock woods. New Eichmond. September. Infrequent. 



This differs somewhat from the Friesian plants in its lack of 

 reddish tints on the cap, and from the plant of Eicken in its larger 

 spores. Britzelmayr gives the spores the same size as ours, and 

 my collection from Sweden also has such spores but shows the slight 

 rufous color when dry. It needs further study but surely belongs 

 in its present position in the group. 



