330 SECTION HYGROPHORUS 



subdistant, white at first, slowly becoming tinged apricot, 1-2 tiers of 

 lamellulae, edges even; when dried pallid to dingy ochraceous buff. 



Stipe 5-9 cm long, (2)4-12(15) mm thick, equal or nearly so, 

 surface dry, twisted fibrillose-striate, white-tomentose at base, white, 

 when dried dingy pallid to grayish, apex silky to slightly pruinose but 

 not scabrous. 



Spore deposit white. Spores 7-9.5(10) X 4—4.5(5) fx, obscurely 

 inequilateral in profile, subovate in face view, hyaline in KOH and 

 yellowish in Melzer's solution, smooth, thin-walled. Basidia 48-60 X 

 7-8 /a, 4-spored, hyaline in KOH, sections of hymenium yellowish in 

 Melzer's. Gill trama divergent. Epicutis of pileus a thin layer of 

 gelatinous narrow (1.5-3 /*) hyphae yellowish to hyaline in KOH. 

 Glamp connections present. 



Habit, Habitat, and Distbibution — Caespitose under pine and 

 fir, gravelly soil. Cottonwood Creek near Summit, Boise National 

 Forest, Idaho. June 15, 1958, Ellen Trueblood 307. 



Obsebvations — This species appears to be closely related to 

 H. saxatilis and H. karstenii but differs in gill color. In both these 

 species the gills are yellow at first. The clusters of fruiting bodies of 

 H . ellenae remind one of Clitocybe, but the bilateral gill trama excludes 

 that genus. H. subsordidus has a stockier fruiting body with slightly 

 narrower spores. There is the possibility that Wyoming collections 

 tentatively identified as H. subsordidus actually represent H. ellenae, 

 but we have made our decision on the spore characters. The fruiting 

 bodies of the various western collections all compare better with each 

 other than they do with Florida specimens of H. subsordidus. 



201 



Hygrophorus sordidus Pk. 



Torrey Bot. Club Bull. 25: 322. 1898 



Illustrations: 

 Fig. 103. 



Hard, Mushrooms, fig. 176. 

 Kauffman, Agar. Mich., pi. 27. 

 Smith and Hesler, Lloydia 2, pi. 12. 



Pileus 8-20 cm broad, convex then expanded plane, pure white or 

 rarely tinged yellowish buff on the disc, viscid, glabrous, margin at 

 first involute and subnoccose, even. Context moderately compact, 

 thick, white; odor and taste mild. 



Lamellae adnate to decurrent, white, slightly yellowish in age, 

 subdistant, rather broad, acuminate at the ends, subintervenose. 



