202 SECTIOX HYGROCYBE 



Habit, Habitat, and Distribution — Gregarious on grassy soil, un- 

 der brush, Michigan, September. 



Material Studied — Michigan: Smith 15376 (type, from along the 

 Huron River, Ann Arbor, Sept. 15, 1940). 



Observations — The convex viscid pileus, dry stipe, adnexed gills, 

 and white color throughout amply characterize this species. It appears 

 to be the counterpart of H. flavescens but is white instead of yellow. 

 Singer ( 1951 ) says that white forms have been observed among groups 

 of H. flavescens which are indistinguishable from H. huronensis. An- 

 other white species, H. purus, differs in its sharply conic pileus and 

 viscid stipe. Lactifers are present in the flesh of the pileus and occa- 

 sionally in the gill trama of H. huronensis, but are not as large as 

 those of H. flavescens. 



115 



Hygrophorus subluridus Murr. 



Torrey Bot. Club Bull. 66: 159. 1939 



Illustration : 

 Fig. 9d. 



Pileus about 3 cm broad, convex to expanded, broadly umbonate, 

 fuscous, slimy-viscid, glabrous, delicately reticulate in part, margin 

 even. Context rather thin, white, unchanging; odor none. 



Lamellae adnexed, rounded behind, narrow, ventricose, pallid to 

 fuscous, crowded, inserted, entire. 



Stipe 6 cm long, 4 mm thick, subconcolorous, equal, glabrous. 



Spores 3-4.5 X 3-3.5 ll, globose to subglobose, smooth, pale yellow 

 in Melzer's reagent. Basidia 24-37 X 4.5-7 ll, 4-spored. Pleurocystidia 

 and cheilocystidia none. Gill trama subparallel, in some sections 

 slightly interwoven. Cuticle of closely interwoven hyphae bearing an 

 ixotrichodermial turf, or palisade, 75-110 ll high, and composed of nar- 

 row, non-septate hyphae, 2-5 ll broad; pileus trama interwoven, the 

 hyphae more or less radially disposed. Clamp connections present. 



Habit, Habitat, and Distribution — Solitary on soil, under oak, 

 Florida, September. 



Material Studied — flork>a: Murrill F18292 (type, from Hunter's 

 Station, near Gainesville, Sept. 6, 1938); Hesler 18457, from Gaines- 

 ville, Aug. 16, 1944. 



Observations — The description of microscopic characters given 

 above is based on our study of the type. 



Sections of the stipe of the type showed no gelatinous hyphae on 

 the surface, despite Murrill's statement which accompanies the speci- 

 mens that the stipe is viscid. 



