SI BSECTIOH HYGROi I Bl 169 



Material Sn nun — mains: Bigelov* 3232, 3628, 3806. massa< hi 

 setts: Bigelow 7234, 9079; Davis, South Acton, Aug. L916; Stow, toig. 

 1916 and July 1917. mk edgan: Smith 37312; Thiers 3941. north i mo- 

 lina: HeslerA Sharp L2737; Hesler 1 1437, 21813, 22383; Smith loi 19. 

 1 1 wi sssee: Heslei 18624, L9174, 20881. gri \\ smoki mts. national 

 park: Smith 9930, 10617. < \\ \d\: ( Quebec) Bigelow 5515, 5516, 5517. 



\i i in iii.wds: Has L655. 



Observations — The nitrous odor and grav-brnwn colors distin- 

 guish this species from its near relatives. It is closely related to 

 //. nitiosttS which is characterized by a nitrous odor and a pinkish to 

 brownish color-change on bruising; and to //. oviiitis in which tin- 

 odor is mild or at times faintly fruity and the color of the flesh, gills, 

 and stipe changes to pinkish to brownish where bruised. 



Hygrophorus erinensis Dennis 

 Kew Bull. 2: 262. 1953 



Illustration: 



Dennis, Kew Bull. 2, fig. 7. 



Pileus 1.5 cm broad, convex then subumbilicate, cinnamon brown. 

 umbilicus minutely squamulose. Context white, thin. 



Lamellae adnate, white, subdistant. 



Stipe yellowish, shining, slender, cylindric, fistulose, glabrous. 



Spores 8-11 X 6-7 p, ellipsoid. Basidia 50 X 10 fx, 4-spored. Pleuro- 

 cystidia and cheilocystidia none. Clamp connections present on the 

 cuticular hyphae. 



Habit, Habitat, and Distribution — Solitary on bare soil, under 

 palms (Bactris), Trinidad. 



Material Studied — trinldad: Dennis 302 (type). 



Observations — Dennis ( 1953 ) says that in habit this species sug- 

 gests a brown variety of H. firmus Berk. & Br., but that the basidia are 

 not dimorphous. It also somewhat resembles H. nitratus var. glauco- 

 nitens (Ft.) Bres. (Bresadola Tab. 354, 1) which has spores 9-11 X 

 5-6 p but a brown stipe and a nitrous odor. 



Notes on the type: Spores 8-11 X 6-7 tt, ellipsoid, smooth, yellow- 

 ish in Melzer's reagent. Basidia 46-62 x 7-10 /x, 2- and 4-spored, sterig- 

 mata stout. Pleurocystidia and cheilocystidia none. Gill trama parallel, 

 hyphae broad (6-14 /*). Cuticle with surface hyphae repent, or on the 

 disc (which is minutely squamulose), the surface hyphae are thin- 

 walled, erect to semi-erect, broad (6-12 /x), fuscous, septate, more or 

 less constricted at septa, and with clamp connections. 



