SI BS1 CTION HYGROCYBl 



w hat fibrillose, disc becoming more or less squamulose, moist not \ is- 

 c i( 1 . somewhat rimose, margin even. Context thick on disc, thin on 

 margin, pallid to brownish, unchanging when bruised, brittle, Fragile; 

 odor fragrant, taste slightly alkaline 



Lamellae adnexed then emarginate, whitish to grayish, becoming 

 pinkish to reddish brown when bruised, broad (up to 12 mm), dis- 

 tant, many short, edges e\ en. 



Stipe 3-6 cm 4-8 mm, grayish (not matched , unchanging when 



handled, drying blackish, at times compressed, flexuOUS, base attenu- 

 ated, hollow. 



Spores 5-6(7) x .5-6 //. globose, subglobose, subovoid, or rarely 

 short-ellipsoid, smooth, white in deposit, pale yellowish in Melzer's re- 

 agent. Basidia 34—48 x 6-8 p, 2- and 4-spored. Pleurocystidia 56-115 x 

 6-10 fi. scattered, cylindric to subfusoid. projecting; and pseudocystidia 

 88-96 x 4.5-6 /* with brownish contents, cheilocystidia 64-78 X 2.5)7 

 10 //, cylindrical, few. Gill trama subparallel, hyphae 7- IS ,, broad. 

 Cuticle of more or less erect hyphae (turf), a trichodermium, or at 

 times repent hyphae which are septate, pale fuscous, the terminal ele- 

 ments with rounded apices. Hvpoderminm none. Pilens trama of 

 radially disposed hyphae. Clamp connections rare on the cnticnlar hy- 

 phae. Lactifers brown, in the trama of the gills and pilens. 



Habit. Habitat, and Distribution — Gregarious on soil in decidu- 

 ous woods, Massachusetts, North Carolina, and Tennessee. June- 

 August. 



Material Studied — Massachusetts: Bigelow 7542. north Caro- 

 lina: Hesler 13982. Tennessee: Campbell & Hesler 21824; Hesler 22683 

 (type, on soil in deciduous woods. Cades Cove, Great Smoky Mts. 

 National Park, June 8, 1957). 24404. 24511 (from type station ). 



Observations — This is close to H. ovinus. differing in its globose 

 to subglobose spores, and in the presence of cvstidia on the gills. The 

 brown lactifers in the trama of the pilens and gills are conspicuous, but 

 no latex was exuded when the fresh fruiting bodies were injured. The 

 ends of these elements occasionally extend into the hymenium as pseu- 

 docystidia. 



84 



Hygrophorus atro-olivaceus Sm. & Hes. 



Sydowia 8: 326. 19.54 



Illustrations: 



Fig. 47; also 8b. 



Pilens 1-3 cm bread, convex with a straight margin, soon coin ex- 

 depressed, at times piano-depressed with a deenrved margin, "inninmv 



