Full name: Hygrophorus montanus Murrill (1911)
Published: Mycologia 3 (4): 199 (1911)
Taxonomic status: Heterotypic synonym of H. discomorbidum
Types: JAMAICA: New Haven Gap (approx. 18.0833°N, 76.65°W, alt. approx. 1700 m a.s.l.), 4 Jan. 1909, E.L. Murrill, W.A. Murrill (WAM769), det: W.A. Murrill (Holotype. herbarium acc. no. NY 774901, HJB1000585).

Diagnosis: Pileus plane or convex, smooth, depressed, gregarious, 2.5 cm. broad; surface smooth, viscid, stramineous to isabelline, with a testaceous tint, margin incurved, white, entire; lamellae adnexed, rather broad, yellowish-white, discolored in blotches on drying, pruinose on the edge; spores pip-shaped, smooth, faintly yellowish, 8–10 X 4–5 µ; stipe shining, watery-white, smooth, cylindric, equal, fleshy-fibrous, 4 cm. long, 5 mm. thick; veil very slight, not forming an annulus.

Commentary: Hesler examined the holotype in 1974 and left a herbarium note concluding that this was a Hebeloma. It appears that R.W.G. Dennis had previously examined this material and reached the same conclusion. Halling (1986) pointed out that this was a Hebeloma, referencing Hesler & Smith (1963). With the mainly ventricose and occasionally clavate-ventricose cheilocystidia, and the spores amygdaloid and distinctly dextrinoid this belongs to Hebeloma sect. Hebeloma. Given the habitat, it is most likely in the group of species that includes H. hygrophilum, H. monticola, H. nigellum and H. palustre. The protologue does not mention the density of lamellae but an analysis of the exsiccata suggests around 40 full-length lamellae. which would rule out H. hygrophilum and H. nigellum, which normally never have more than 36 full-length lamellae. The spores, could correspond to either H. monticola or H. palustre, but the number of lamellae would fit better with H. palustre. While we were unable to generate any DNA sequence data from the material, that might confirm this identification, we are confident that this is a correct identification. Hence this taxon should be synonymized with H. palustre. We see no point in creating a superfluous name by recombining this as a Hebeloma, but include it within the synonyms of H. palustre. To summarize, based on morphological and habitat data, this is: = H. palustre Peck.