208 THE AGARICACEAE OF MICHIGAN 



(b) Veil felt-like, breaking up into areolate patches. 



(c) Rhizomorph or ozonium not evident; plants densely caespitose. 



192. C. ebulbosus Pk. 

 (cc) Rhizomorph or ozonium present. 



(d) Plants growing from rhizomorph; 5-8 cm. broad. 191. C. 



quadrifidus Pk. 

 (dd) Plants growing from fine yellow ozonium; 1-3 cm. broad. 

 193. C. laniger Pk. 

 (bb) Veil not as above. 



(c) Veil of fibrillose scales or a dense coat of white mealy vesicles, 

 (d) Spores less than 10 micr. long, 

 (e) Gills broad; growing upon sand. 199. G. arenatus Pk. 

 •(ee) Gills narrow. 



(f) Disk livid; upon rotten wood in forest. 197. G. lago- 



pides Karst. 

 (ff) Disk buff; upon cellar walls. 198. C. jonesii Pk. 

 (dd) Spores more than 10 micr. long, 

 (e) Gills attached, 

 (f) Disk obtuse; reddish or reddish brown. 202. G. domes- 



ticus Fr. 

 (ff) Disk narrow, not colored; veil often composed of mealy 

 vesicles. 200. C. niveus Fr. 

 (ee) Gills free. 



(f) Pileus at first cylindrical. 196. C. tomentosus Fr. 

 (ff) Pileus not cylindrical. 



(g) Veil more or less mealy; plants small, not in troops, 

 (h) Spores 11-13 micr. long. 201. G. semilanatus Pk. 

 (hh) Spores 15-17 micr. long. 200. C. niveus Fr. 

 (gg) Veil never mealy; plants large; in troops upon dung 

 heaps, 

 (h) Stem not rooting. 194. G. fimetarius Fr. 

 (hh) Stem rooting. 195.- C. fimetarius var. macrorhizus 

 Fr. 

 (cc) Veil of small granules or rnicaceus particles, 

 (d) Spores less than 10 micr. long. 



(e) Plants not growing from ozonium; densely caespitose. 



203. C. rnicaceus Fr. 

 (ee) Plants from ozonium or at least with radiating mycelium 

 at base of stem, single or caespitose. 204. G. radians Fr. 

 (dd) Spores 10-12 micr. long. 209. G. rnicaceus var. conicus Pk. 

 (AA) Pileus thin, plicate; if subfleshy then less than 3 cm. broad when 

 expanded, 

 (a) Veil present as superficial scales or granules. 



(b) Ring present upon the stem. 205. G. bulbilosus Pat. 

 (bb) Ring absent. 



(c) Pileus covered with a dense white floccose or mealy coat, 

 (d) Spores 12 micr. or more long. 



(e) Spores 12-13 micr. long. 201. G. semilanatus Pk. 

 (ee) Spores 15-16 micr. long. 200. G. niveus Fr. 

 (dd) Spores less than 12 micr. long. 



(e) Plants growing from black sclerotia in dung. 207. C. 



sclerotigenous E. & E. 

 (ee) Not growing from sclerotia. 



(f) Plants growing upon plant stems. 209. C. brassicae Pk. 

 (ff) Plants growing upon dung or soil. 



(g) Odor strong; spores 10-11 micr. long. 208. C. nar- 



coticus Fr. 

 (gg) Little or no odor; spores 6-8 micr. long. 206. G. 

 stercorarius. 

 (cc) Pileus with a few rnicaceus particles or granules, 

 (d) Spores ovate triangular or pentagonal, compressed. 210. 



G. patoiiilla?-di Quel, 

 (dd) Spores elliptical. 211. C. radiatus Fr. 



