181 THE AGARICACEAE OF MICHIGAN 



162. Hygrophorus olivaceoalbus Fr. 



Syst. Myc, 1821, and Fung. Trid., 1881. 



Illustrations: Fung. Trid., Vol. I, PL 92. 

 Plate XXV of this Report. 



PILEUS 4-8 cm. broad, at first acorn-shaped or rounded-cam- 

 panulate, then convex to subexpanded, urabonate, umbo often obso- 

 lete, covered by a thick gluten, dark, olive-gray, stained ferruginous 

 in age, at length somewhat wrinkled from the drying gluten, mar- 

 gin at first involute. FLESH white, thick, rather soft. GILLS 

 adnate to decurrent, subdistant to close, moderately broad, dis- 

 tinct, white or slightly incarnate, trama of divergent hyphae. 

 STEM rather stout, 4-7 cm. long, 8-15 mm. thick, equal or tapering 

 downward, peronate at first and fioccose-scaly from the glutinous 

 veil, at length marked by rusty-fuscous, subannular, irregular 

 stains, apex at first beaded with drops and densely white-scaly- 

 dotted, solid, subrooting and curved at base. SPORES broadly 

 elliptical, smooth or slightly rough-punctate, 9-12 x G-7 micr. 

 BASIDIA elongated. 50x8-9 micr. ODOR and TASTE mild. 



Gregarious or subcaespitose. On the ground in woods of oak, 

 maple, etc. Ann Arbor. October. Found but once. 



This is a very marked species. The sheathed, floccose stem with 

 its several rings of staining gluten separates it from nearby species. 

 The base of the stem is usually deep in the ground. Bresadola's 

 figures show a darker plant, while Gillet, Michael and Ricken 

 figure a more slender plant. The colors of our plants approach 

 more nearly those of the last three authors. 



Section If. Partiales. Universal veil none. Partial veil or eor- 

 tina floccose, adhering to the involute margin of the pileus. Stem 

 dry, apex floccose-scabrous or subglabrous. 



This section corresponds to the subgenus Phlegmacium of the 

 genus Cortinarius. The stem is dry except when the gluten of the 

 cap falls upon it. The viscidity of the pileus is due to a gelatinous 

 layer on its surface which becomes glutinous in some species in 

 wet weather. 



