212 SECTION HYGROCYBE 



moist. Context thin, waxy, yellowish; odor and taste not distinctive. 



Lamellae adnexed, "mustard yellow" to "pinnard yellow," broad, 

 close to subdistant, edges even. 



Stipe 4-7 cm long, (5)8-12(16) mm thick, base whitish, mid- 

 portion orange, apex more or less concolorous with lamellae, equal or 

 attenuated below, often compressed and grooved on one side, fragile 

 and easily splitting, glabrous or faintly fibrillose at first, lubricous to 

 moist or dry (not viscid), hollow. 



Spores 7-8(9) X 4-5 /x, ellipsoid, smooth white in deposits, yellow 

 in Melzer's reagent. Basidia 26-40 X 6-10 /*, 2- and 4-spored, clavate 

 and base not prolonged. Pleurocystidia and cheilocystidia not differ- 

 entiated. Gill trama parallel, hyphae 8-22 jx broad. Lactifers present in 

 both pileus and gill trama, 60-150 X 4-10 /x, golden yellow in Melzer's 

 reagent. Pileus trama homogeneous. Cuticle a narrow zone of gelati- 

 nous repent hyphae (an ixocutis). No hypodermium differentiated. 

 Pileus trama of radial hyphae. Clamp connections on the hyphae of 

 the cuticle and subhymenium. 



Habit, Habitat, and Distbibution — Gregarious on soil and hu- 

 mus, in deciduous, coniferous, and mixed woods, Canada, Maine, 

 Massachusetts, New York, Pennsylvania, Virginia, North Carolina, 

 Tennessee, Texas, Michigan, Washington, and California, January 

 and June-November; also Scotland, Switzerland, and Japan. 



Matebial Studied — califobnia: Lanphere 62; Newhall, Wood- 

 side, Jan. 1934; Smith 3512, 3886, 9168, 9464; Smith 56512. maixe: 

 Bigelow 3296, 3336, 3337, 3338, 3339, 3340, 3783, 4101; Rea 521. 

 Massachusetts: Bigelow 6583, 6654, 6688, 7223, 8062, 8161, 8249, 

 8314, 8869, 8913, 9261; Darker 5708 (Farlow Herb.). Michigan: 

 litis, Douglas Lake, July 24, 1947; Imshaug 3488; Kauffman, Mar- 

 quette, Sept. 1, 1906, 202; Smith 1365, 1420, 1935 (type, Whitmore 

 Lake, June 22, 1935), 6380, 6580, 15562, 21492, 21908, 22097, 32556, 

 33128, 36503, 37081, 37273, 39465, 41724, 41753, 50081; Smith & Brooks 

 1038, 1207, 1289, 21696, 21857; Thiers 1912, 3028, 3207, 3260, 3414, 

 3495, 3554, 3646. new yobk: Bigelow 5065, 5084; Smith 203. nobth 

 cabolina: Hesler 8053, 11326, 12328; Sharp 9319. Pennsylvania: 

 Kauffman, Mt. Gretna, Sept. 10, 1924. Tennessee: Bain 7901; Campbell 

 22124; Hesler 4369, 4370, 4373, 4374, 4375, 4429, 7326, 11433, 12240, 

 17486, 19700, 20892, 21321; McCarroll 4372; Sharp 4371; Underwood 

 4406. texas: Thiers 4727. Washington: Imshaug 1106; Smith 16707, 

 29908, 31044, 49246. Canada: (Ontario) Hoare, Aug. 22, 1951, 28934; 

 Smith 26416; (Quebec) Bigelow 5017, 5019, 5501. 



Obsebvations — According to our experience this is a common 

 species and both of us, as well as other American mycologists, have 



