282 SECTION HYGROPHORUS 



Habit, Habitat, and Distbibution — Gregarious to subcaespitose, 

 in pine woods, Massachusetts, Pennsylvania, Maine, New York, Idaho, 

 and Oregon, October-November. 



Material Studied — idaho: Smith 54067, 54792. maine: Parlin 

 15373, 15374a. Massachusetts: Bigelow 7957, 7958, 9397. new york: 

 Peck (type). Oregon: Smith 19794, 26993, 27067, 27333, 55825. Penn- 

 sylvania: Overholts 16593. 



Observations — The color-change of the pileus on drying, the color 

 of the lamellae, and the size of the spores distinguish this species from 

 its relative H. gliocyclus. In H. gliocyclus the lamellae are yellowish, 

 and the spores are 8-10(11) X 4.5-6 /x. The pileus of H. fiavodiscus is 

 white with a pale-yellow or reddish -yellow disc; on drying, however, 

 the pileus becomes ochraceous orange or ochraceous buff (decidedly 

 yellow). In H. gliocyclus there is only slight change in the color of the 

 pileus on drying. See also remarks under H. gliocyclus. 



Notes on Peck's type: Spores 6-8 X 3.5-5 /x, ellipsoid, yellowish in 

 Melzer's reagent. Basidia 34-52 X 6-7 /x, 4-spored. Pleurocystidia and 

 cheilocystidia none. Gill trama divergent, hyphae 3-8 /x broad. Cuticle 

 a gelatinous zone 180-350 /x thick, with tangled, imbedded, narrow 

 (3-5 /x) hyphae, with a conspicuous, yellow pigment-deposit. No hypo- 

 dermium differentiated. Pileus trama interwoven, hyphae disposed 

 both radially and periclinally. Clamps present in cuticle. 



169 



Hygrophorus gliocyclus Fr. 



Monogr. Hymen. Suec. 2: 311. 1863 



Illustration: 



Bresadola, Icon. Myc, tab. 302. 



Pileus (2)4-9 cm broad, convex, obtuse or expanded, subumbo- 

 nate, "chamois" to "cream buff," whitish on margin, glutinous, with a 

 separable pellicle, glabrous, margin even, at first involute. Context 

 compact and thick on the disc, abruptly thin on the margin, white, un- 

 changing; odor and taste mild. 



Lamellae broadly adnate to decurrent, subdistant, broad behind, 

 narrow in front, "ivory yellow" to more dingy-yellowish in age, edges 

 even. 



Stipe (2)3-6 cm long, (6)8-12(20) mm thick, equal to slightly 

 ventricose, abruptly attenuated below, whitish to "chamois," sheathed 

 by a hyaline, glutinous veil which terminates in a narrow sometimes 

 obsolete, glutinous annulus, the apical region at first white floccose but 

 becoming silky-fibrillose, solid. 



