CLASSIFICATION OF AGARICS 517 



from the point of attachment of the pileus, where thej either ran 

 down to a point or are abruptly rounded behind. They are ol 

 broad and soft and collapse when mature, but Bometimea are yerj 

 narrow and crowded; in age thej become stained or Bpotted l>\ 

 the copious spores. The Bhort STEM <>r tubercle-like point of 

 attachment is usually somewhat tomentose or villose even In other 

 wise glabrous plants. The SPORES are an important means <>t 

 diagnosis of the species of this genus, since a Dumber of Bpecies 

 have a very similar general appearance. Peck points <>ut thai 

 European mycologists bave neglected to give as careful measure 

 ments for the spores i>r their species. I bave used the spore char 

 acter in the keys, since it is the only reliable method <>f studying 

 the group, and as the species are ao1 as a rule used for food, the 

 mycophagist will qo1 Deed much attention. The spores in differ- 

 ent species vary from brown to ferruginous and often stain tin- 

 pilei when tin- latter grow in an imbricate fashion. 



Fifteen species are reported from Michigan; all bu1 two 1 have 



collected. 



Key to the Species 



(A) Spores elliptical or oval. 



(a) Pileus scarlet-red, substipitate. 555. C. cinnabarinus Pk. 

 (aa) Pileus not red. 

 (b) Pileus viscid, hygrophanous, sessile, white when dry. 550. C. 



harrms Pk. 

 (bb) Pileus not viscid, 

 (c) Pileus with a subgelatinous surface, sessile, glabrous. 551. 



C. mollis Ft. 

 (cc) Pileus not gelatinous. 



nit Pileus distinctly stipitate, minutely scaly. 4-8 mm. broad, 



tawny, tinged gray. 556. C. sipiaritts Pk. 

 (dd) Pileus sessile, 

 (e) Pileus glabrous, whitish, resupinate. 552. C. albidus K 



E. 

 (ee) Pileus not glabrous. 



(f) Pileus covered by a white villosity or tomentum. 

 (g) Pileus 4-10 mm. broad; spores T.r> micr. long. ■• 



C. herbarum Pk. 

 (gg) Pileus 8-20 mm. broad; spores 9-10 micr. long. .".". t. 

 C. vrrsutus Pk. 

 ( ft i Pileus covered by a dense dark-colored tomentum v 

 young. 

 (g) Spores 8-10x5-6; pileus with a thin tawny tomentum. 



hygrophanous. 557. O. fulvotomentosvs Pk. 

 (ggi spores 6-6x4-4.5; pileus with a rufous-hrown ton. 

 .turn, not hygrophanous. r>r.s. r. calolepis Fr. 

 (AA) Spores Bpherical. 



(a) Pileus white or whitish. 

 (in Pileus Buhtomentose, densely villose at base; gills broad; b] 



6-7 micr. 559. C. putrigenus P.. A C. 

 (bb) Pileus glabrous excepl ;it attachment. 



(c) Stipitate. stem 2-4 mm. long; pileus usually mareinate behind 

 Spores 5-5. ."> mirr. 562. 0. stipitatus sp. nov. 



