136 SECTION HYGROCYBE 



the American species. However, Agarictis croceus Bull, was originally 

 described as blackening, and has been referred to H. conicus as a 

 synonym. Hence Bresadola's concept does not appear to be justified. 



Bigelow collected a form in Massachusetts (No. 6983) in which 

 the apex of the stipe was reddish rather than the typical "deep 

 chrome." 



In regard to clamp connections, Hesler found none on the type, 

 but they are present on other collections which seem to be identical 

 with the type in all other respects. Before giving much weight to this 

 difference, a critical study of the clampless type form should be made 

 from fresh material. 



Hygrophorus acutoconicus (Clements) Sm. var. acutoconicus 

 North Amer. Species of Mycena, p. 472. 1947 



Mycena acutoconica Clements, Bot. Survey Nebr. 2: 38. 1893. 

 Prunulus acutoconicus (Clements) Murr., North Amer. Flora 9: 330. 



1916. 

 Hydrocybe calif ornica Murr., North Amer. Flora 9: 382. 1916. 

 Hygrocybe langii Kiihner, Le Botaniste 18: 175. 1927. 

 Hygrophorus langii Dodge, Rhodora 29: 239. 1927. 

 Hygrocybe constans Lange, Dansk Bot. Ark. 4(4): 24. 1923. (Not 



Hydrocybe constans Murr. ) 

 Hygrophorus ravenelii sensu Coker, Elisha Mitchell Sci. Soc. Jour. 45: 



164. 1929. 

 Hygrocybe subruber Murr., Torrey Bot. Club Bull. 66: 159. 1939. 

 Hygrophorus subruber Murr., Torrey Bot. Club Bull. 66: 160. 1939. 

 Hygrocybe acutoconica (Clements) Singer, Lilloa 22: 153. 1951. 

 Hygrophorus rickenii Maire. Bull. Soc. Mycol. France 46: 220. 1930. 



Illustrations: 



Figs. 36 and 37. 



Coker, Elisha Mitchell Sci. Soc. Jour. 45, frontispiece (fig. 1), and 



pis. 10 and 23 (figs. 1-2) (as H. ravenelii B. & C.) . 

 Smith and Hesler, Lloydia 5, pi. 9 (as H. langii Kiihner). 

 Lange, Flora Agar. Dan. 5, pi. 167C (as H. constans Lange). 



Pileus 2-10 cm broad, obtusely to sharply conic when young, soon 

 campanulate or the margin finally spreading or upturned, "wax yel- 

 low," "cadmium yellow," "ochraceous buff," "ochraceous orange," to 

 "rufous," scarcely fading, glabrous, splitting radially, viscid or glutinous, 

 margin striatulate when wet, even when dry. Context soft, thin on the 

 margin, thickish under the umbo, yellow; odor and taste mild. 



Lamellae free or narrowly adnexed, yellow, ascending, ventricose 

 and moderately broad, close, becoming subdistant, edges entire, be- 

 coming eroded at times, faces more or less rugulose. 



Stipe 6-8(12) cm long, 3-6(12) mm thick, concolor to pileus in- 



