426 THE AGARICACEAE OF MICHIGAN 



is at first incurved, and the smaller, slender species with sub- 

 membranaceous pileus whose margin is at first straight on the stem 

 in the manner of the genus Galera. They are distinguished from 

 the Telamonias only by the absence of the universal veil although 

 several have at times a slight annulus from the collapsing of the 

 copious cortina and not from the outer veil. The pileus is never 

 viscid ; it is moist when growing but the moisture disappears quickly 

 in sun and wind so that in our climate the dry, faded plant is 

 more often found than the moist plant. However, for identifica- 

 tion of most of the species of this subgenus it is absolutely neces- 

 sary to know the colors of both the moist and dry pileus since in 

 many of the species the pileii have a similar color when dry. 

 I consider this the most difficult of the subgenera of Cortinarius 

 both because of the great variability of the colors of most species,, 

 and because of the unsettled condition in which the European 

 authors have so far left it. While at Stockholm, Sweden, I paid 

 special attention to this group, and found a number of Friesian 

 species; in many cases, however, these do not agree well with the 

 spore characters as given by various authors. It is clear that only 

 a temporary arrangement can be given of our species and it seemed 

 best to put on record descriptions of such species as are close to 

 the Friesian ones, as unnamed variations under the Friesian names. 

 In Michigan the Hydrocybes seem to be much more numerous in 

 the coniferous regions of the State than in frondose woods as ap- 

 pears to be also the case in Europe. I have no doubt we have quite 

 a number of species which are truly American. 



Section I. Margin of pileus at first incurved. Pileus thickish r 

 of a medium or fairly large size. Stem somewhat stout. 



*Stem or gills at first violaceous. 



440. Cortinarius imbutus Fr. 



Epicrisis, 1836-38. 



Illustration: Cooke, 111., PI. S70. 



PILEUS 2.5-7 cm. broad, convex then expanded, obtuse or sub- 

 uinbonate, even, hygrophanous, chestnut- brown when moist, chang- 

 ing color, alutaceous or rufous-tinged on disk when dry and then 

 becoming somewhat hoary, margin at first incurved and sometimes- 



