SUBSECTION CAMAROPIIYLU 377 



punctate upper portion of the stipe all strongly point to a relationship 

 with H. arbustivus Fr. sensu Quelet. The thin, close to crowded lamel- 

 lae and possibly the dry stipe distinguish the American species, but a 

 careful comparison of these two should be made. 



232 



Hygrophorus subisabellinus Sm. & Hes. 



Lloydia 2: 40. 1939 



Pileus 4.5-7 cm broad, hemispheric-convex then expanded, ob- 

 tusely umbonate, "pinkish buff" to "cinnamon-buff," margin usually 

 somewhat paler, glabrous but under a lens with a mat of closely woven 

 fibrils, viscid, margin involute and downy. Context white, 10 mm thick 

 on the disc, thin on the margin; odor and taste mild. 



Lamellae adnate, becoming slightly notched, white, close, narrow, 

 tapering at either end, edges even. 



Stipe 4-9.5 cm long, 5-12 mm thick, white, dingy below ( almost 

 concolorous with pileus), dry, upper portion floccose-scabrous, flexu- 

 ous, equal or tapering toward the base, solid. 



Spores 5.5-7 X 3-4 /x, ellipsoid, smooth, very pale yellow in Melzer's 

 reagent. Basidia 38-57 X 5-8 fx, 4-spored. Pleurocystidia and cheilo- 

 cystidia none. Gill trama of divergent, hyphae 7-14 fx broad when fresh. 

 Cuticle a gelatinous zone 75-200 /z thick, with slender, imbedded hy- 

 phae, the surface hyphae brownish, 3-5 /x broad, the subjacent hyphae 

 colorless, some surface hyphae repent, many more or less erect and 

 cystidioid forming more or less of a turf (not a palisade), an ixotricho- 

 dermium. No hypodermium differentiated. Pileus trama of radial hy- 

 phae. Clamp connections present on the hyphae of the cuticle. 



Habit, Habitat, and Distribution — Gregarious on humus in 

 mixed woods, Tennessee, February and May. 



Material Studied — Tennessee: Sharp 11427 (type, collected by 

 A. J. Sharp, Knox County, May 26, 1938); Hesler (Feb. 22-29, 1939). 



Observations — The mild odor and taste, the paler colors, and the 

 mat of closely woven fibrils separate it readily from H. tennesseensis. It 

 lacks the dense pruinose covering of the stipe of H. roseibrunneus as 

 well as the pinkish tan colors of the dried specimens of the latter. 

 The close gills and innate squamules over the upper part of the stipe 

 distinguish it from H. arbustivus Fr. From pale forms of H. pudorinus it 

 is readily distinguished in the dried condition by the lack of reddish- 

 punctate points over the upper portion of the stipe. The dried pilei 

 of the type of H. subisabellinus vary in color from "orange-cinnamon" 

 to "cinnamon." 



