312 SECTION HYGROPHORUS 



Spores (5.5)6-8 X 3-4 fx, oblong-cylindric, smooth, white in mass, 

 yellow in Melzer's reagent. Basidia 35-44 X 5-6 /x, 4-spored. Pleuro- 

 cystidia and cheilocystidia none. Gill trama divergent, hyphae 6-12 fx 

 broad. Cuticle a distinct gelatinous zone 125-180 fx thick, the hyphae 

 (2.5-4 ix broad) forming an ixotrichodermium (not a palisade). No 

 distinct hypodermium differentiated. Pileus trama of loosely inter- 

 woven radial hyphae which are rather broad ( 5-20 fx ) . Clamp connec- 

 tions present on the cuticular hyphae. 



Habit, Habitat, and Distbibution — Gregarious in oak-pine 

 woods, Florida, Alabama, and Texas, November-December. 



Matebial Studied — Alabama: Burke 90. flobida: Murrill 

 F18403 ( type, from Newman's Lake, near Gainesville, Nov. 15, 1938 ) , 

 unnumbered (Jan. 18, 1940, and Dec. 22, 1941); Hesler 20244, 21039, 

 21042, 21049. texas: Thiers 1428. 



Obsebvations — This species is distinguished from H. sordidus by 

 the narrower lamellae and more slender spores. One collection (Hesler 

 20244) was found growing in an arc of a fairy ring, about ten feet in 

 diameter. 



Notes on the type: Spores 6-8 X 3-3.5 fx, oblong-cylindric, smooth, 

 non-amyloid, white in mass, or on white paper tinged cream. Basidia 

 36-42 X 5-6 fx, 4-spored. Pleurocystidia and cheilocystidia none. Gill 

 trama of divergent hyphae, 7-13 fx broad. Cuticle of interwoven, 

 gelatinous hyphae, with numerous free ends; clamp connections 

 present. 



188 



Hygrophorus diaphanes, sp. nov. 



Pileus 3-5 cm lotus, se extendens depressum, glaber, viscidus, albus, 

 demum ruhicundo-ochraceus, deinde albus siccatus; lamellae angustae, 

 adnatae demum aliquantum decurrentes, distantes demum subdis- 

 tantes, colore flos-lacteae; stipes 5-8 cm longus, 5-9 mm crassus, mox 

 cavus, fragilis, siccus, apice pruinosus, glaber infra, albus, rubicundo- 

 flavus; sporae 5.5-7 X 3 fx, oblongae. Specimen typicum in Herb. Univ. 

 Mich.; ledum Sharron Hollow, Washtenaw County, Mich., Aug. 13, 

 1960, A. H. Smith 62895. 



Pileus 3-5 cm broad, broadly convex, expanding to shallowly de- 

 pressed with an arched margin, surface glabrous, viscid, white, pellicle 

 darkening to pinkish buff but fading to white in drying, very thin, 

 translucent when wet. Context thin, white, fragile, odor and taste not 

 distinctive, KOH and FeS0 4 no reaction. 



Lamellae narrow, broadly adnate to somewhat decurrent, distant to 



