194 SECTION HYGROCYBE 



lose, margin opaque, soon blackish along the edge where bruised. Con- 

 text thin, yellowish then dingy pallid; odor and taste nitrous. 



Lamellae ascending, adnate to adnexed, pale yellow when young, 

 fading to pale pinkish buff or near it, broad and ventricose, distant, 

 edges even. 



Stipe 4-5 cm long, 4-7 cm thick, pallid to yellowish-pallid, discolor- 

 ing to brownish where handled, drying to more or less pale fuscous, 

 equal or slightly enlarged below, soon hollow, glabrous and naked ( in- 

 cluding the apex). 



Spores 7-9 X 5-5.5 /x, oblong to subovoid, smooth, hyaline, pale yel- 

 lowish in Melzer's reagent. Basidia 45-50 X 8-9 /*, 4-spored. Pleurocys- 

 tidia and cheilocystidia none. Gill trama subparallel, nearly hyaline in 

 KOH, yellowish in Melzer's solution, and lacking any dark granules. 

 Cuticle a trichodermium of more or less erect, to repent, septate hy- 

 phae, the apical cells not differentiated as to size and shape. No hypo- 

 dermium differentiated. Pileus trama of radially disposed hyphae. 

 Clamp connections present. 



Habit, Habitat, and Distribution — Scattered to isolated in a 

 mixed hardwood and conifer forest, Michigan, August. 



Material Studied — Michigan: Hesler & Smith 41821 (type, Up- 

 per Falls, Tahquamenon Falls State Park, Aug. 3, 1953); Smith 41982. 



Observations — This species would be identified as H. nitratus if 

 it were not for the yellow-ocher pileus and gills, and to some extent 

 the stipe, as well as the staining cap-margin and stipe. H. nitratus is 

 essentially a gray species. H. helvella Boud. is closely related in having 

 ocher-gray colors and in blackening, but is described as having more or 

 less globose spores and a farinaceous odor. Boudier's (1911) illustra- 

 tion is not at all suggestive of our fungus. 



110 



Hygrophorus ovinus ( Fr. ) Fr. 

 Epicr. Myc, p. 328. 1838 



Agaricus ovinu s Fr., Sy st. Myc. 1: 109. 1821. 



Camarophijllus ovinus (Fr.) Kiimmer, Fiihr. in Pilzk., p. 117. 1871. 



Hygrocybe ovina (Fr.) Kiihner, Le Botaniste 17: 44. 1926. 



Illustrations: 

 Fig. 56. 



Bresadola, Icon. Myc, tab. 336. 

 Juillard-Hartmann, Icon. Champ., pi. 48, fig. 9. 

 Lange, Flora Agar. Dan. 5, pi. 166E. 

 Ricken, Die Blatterp., pi. 7, fig. 6. 

 Smith and Hesler, Lloydia 5, pi. 3. 



Pileus 2-5 cm broad, convex to hemispheric, becoming broadly con- 

 vex to somewhat expanded in age, the disc often remaining obtuse or 



