370 SECTION HYGROPHORUS 



Lamellae short decurrent, broad, subdistant, dingy pallid when 

 very young but soon avellaneous or grayer and in age or when dried 

 pale drab, edges even. 



Stipe 1-3 cm long, 2.5-3.5 mm thick, equal, solid, dry, at first gray- 

 ish pallid, slowly becoming dark brown below, surface hoary-fibrillose 

 to furfuraceous with apex more or less pruinose, fibrils over lower part 

 often rusty brown and arranged in minute squamules, surface quickly 

 olive in KOH. 



Spore deposit white, spores non-amyloid, 7-8 X 3-4.5 /x, thin- 

 walled, oblong or nearly so, hyaline, smooth. Basidia 4-spored. Pleuro- 

 cystidia and cheilocystidia none. Gill trama of divergent hyphae. Epi- 

 cutis of pileus a tangled trichodermium of narrow ( 1.5-3 /*) gelatinous 

 hyphae with dingy yellow-brown content in KOH. Clamp connections 

 present. 



Habit, Habitat, and Distbibution — Gregarious under cedar 

 (Thuja occidentalis) , Wilderness State Park, Emmet County, Mich., 

 Oct. 15, 1960. 



Matebial Studied — Michigan: Smith 63323. 



Obsebvations — No chemical reactions were obtained from the type 

 variety so no comparisons on these characters can be made. Var. fallax 

 differs from the type variety in the brown fibrils and squamules at the 

 base of the stipe, and in the structure of the epicutis. 



227 



Hygrophorus avellaneifolius, sp. nov. 



Pileus 3-5 cm lotus, convexus demum obtusus deinde paene planus, 

 glabrosus, glutinosus, "buckthorn brown" demum ochraceofulvus, inter- 

 num zonatus; desunt odor et gustus, immutabilis laesus; lamellae 

 avellaneae, non insigniter mutantes, modice latae, subcrassae, adsunt 

 una vel duae lamellularum ordines; stipes 4-6 cm longus, 9-18 mm 

 crassus, infra constrictus, cinereo-pallidus, immutabilis tactus, siccus, 

 nee pruinosus nee squamulosus; sporae 7-9 X 3.5-4.5 ft, ellipsoideae 

 demum sub-oblongae. Specimen typicum in Herb. Univ. Mich, con- 

 servatum; ledum prope Seven Devils Mts., Idaho, Aug. 23, 1954, A. H. 

 Smith 46584. 



Pileus 3-5 cm broad, convex to obtuse when young, expanding to 

 plane or nearly so, margin at first incurved, surface glabrous, glutinous, 

 dark "buckthorn brown" to dingy dark-ochraceous tawny, gradually 

 more or less clay color at least on the margin, at times zoned in age. 

 Context brownish near the cuticle, grayish toward the stipe, unchang- 

 ing when bruised; odor and taste none. 



Lamellae broadly adnate to decurrent "avellaneous" or nearly so, 





