422 THE AGARICACEAE OF MICHIGAN 



and unicolor when moist, the universal veil at first concolor but on 

 breaking up leaving a whitish, medium, somewhat persistent annular 

 zone. CORTINA whitish, fibrillose. SPORES oval, rough-tuber- 

 riilatc, 6-8x5-6 micr. ODOR sometimes slightly of radish. TASTE 

 mild. 



I ; regarious or eaespitose. On grassy ground in f rondose woods. 

 Houghton, Ann Arbor, Detroit, etc. July to September. Frequent. 



This is one of the earliest summer Cortinarii, appearing prefer- 

 ably in low, grassy woods, about the time that C. cinnabarinus ap- 

 pears in the higher lying oak woods; it announces the fact that the 

 Cortinarius season is open. It is somewhat difficult to see much 

 difference in the formal descriptions between this and C. brunneus 

 Fr., C. brunneofulvous Fr. and C. glandicolor Fr., but our plant 

 has quite a distinct habit as compared with those. Its gills are 

 truly distant while C. brunneus in spite of Fries' description, has 

 more nearly subdistant gills, according to my use of those terms. G. 

 glandicolor Fr. is a more slender-stemmed plant, according to Fries' 

 unpublished plates, well shown also by Cooke (111., PI. 789), although 

 figured as rather stout by Ricken (Bliitterpilze, PI. 50, Fig. 3). 

 Peck, in the original description, seems to have had specimens whose 

 caps were "convex." All the specimens seen by me had a tendency 

 toward the campanulate and umbonate form of pileus. The white 

 zone at or below the middle of the stem is best seen in dry weather. 

 The young stem is sometimes peronate. C. furfurellus Pk. is with- 

 out doubt a synonym. 



435. Cortinarius nigrellus Pk. 

 N. Y. State Mus. Rep. 26, 1874. 



"PILEUS 2-5 cm. broad, at first conical, soon convex or expanded 

 or subumbonate, minutely silky, hygrophanous, blackish-chestnut 

 when moist, paler when dry. GILLS close, narrow, emarginate, 

 broicnish-ochre at first, then cinnamon. STEM 5-7 cm. long, 4-6 

 mm. thick, subequal, silky-fibrillose, pallid, often flexuous (slightly 

 peronate by a rufous-tinged sheath in the dried type specimens). 

 ANNULUS slight, evanescent." SPORES inequilateral, minute, 

 smooth, 7x3.5 micr. 



"Mossy ground in woods, New York. October. When moist the 

 pileus has the color of boiled chestnuts, when dry of fresh chestnuts. 

 The incurved margin of the young pileus is whitened by the veil. 



