124 SECTION HYGROCYBE 



niger, virgatus, demum rimosus. Odore et gustu mitis. Lamellae ad- 

 nexae, albae, confertae vel subdistantes, latae. Stipes 3-6 cm longus, 

 5-10 mm crassus, albus, fragilis, siccus, cavus, aequalis vel sub-bulbosus. 

 Sporae 8-10 x 4.5-6 /x, ellipsoideae, albae demum luteae. Pleurocysti- 

 dia et cheilocystidia desunt. Specimen typicum in Herb. Univ. Tenn.; 

 ledum prope Knoxville, Tenn., October 7, 1957, L. R. Hesler 22705. 



Pileus 2.5-5 cm broad, convex, soon expanding conic-convex or 

 campanulate and acutely umbonate, splitting and margin upturned, 

 viscid. "Dresden brown," disc blackish, virgate, becoming rimose. Con- 

 text thin, fragile, watery to pallid; odor and taste mild. 



Lamellae adnexed, narrowly attached, white, unchanging, close or 

 subdistant, broad, ventricose, edges even. 



Stipe 3-6 cm X 5-10 mm, white, fragile, splitting easily, dry, some- 

 what fibrillose-striate, hollow, equal or sub-bulbous. 



Spores 8-10 X 4.5-6 /x, broadly ellipsoid, smooth, white becoming 

 "Naples yellow" to "mustard yellow" a few weeks after being stored in 

 the herbarium, yellowish in Melzer's reagent. Basidia 42-56 X 8-10 /x. 

 Pleurocystidia and cheilocystidia none. Gill trama parallel or subparal- 

 lel, hyphae 6-20 /x broad. 



Habit, Habitat, and Distbibution — On soil, lawn, adjacent to 

 oak woods, Tennessee, October. 



Matebial Studied — Tennessee: Hesler 22705 (type, from near 

 Knoxville, Oct. 7, 1957). 



Obsebvations — This appears to be H. spadiceus with white, in- 

 stead of yellow, gills, flesh, and stipe. Murrill (1944) has described 

 Tricholoma hygrophorum (from Florida) which resembles our var. 

 albifoUus, and the two should be compared in the fresh state. 



59 



Hygrophorus marginatus var. olivaceus Sm. & Hes. 



Lloydia 5: 40. 1942 



Tricholoma marginatum var. olivaceum (Sm. & Hes.) Singer, Lilloa 

 22: 224. 1951. 



Illustration: 

 Fig. 32. 



Pileus 2.5-3.5 cm broad, sharply conic, becoming sharply conic- 

 campanulate and finally nearly plane except for a sharp conic umbo, 

 color "olive brown" to "deep olive" over central portion or over all when 

 real young, soon pale dull orange near the margin, in age the olive 

 fading and the orange more widespread (never brilliant orange), sur- 

 face glabrous and moist but not viscid, margin translucent striate. 



