Published: Mycologia 4 (2): 83 (1912)
Taxonomic status: This is a Pyrrhulomyces.
Notes: Current name is: Pyrrhulomyces subincarnatus (Murrill) Beker & U. Eberh., comb. prov.
Types: JAMAICA: trail from Monkey Hill to Sir John Peak. Possible Saint John Peak, near Portland Parish (approx. 18.0471°N, 76.5556°W, alt. approx. 1800 m a.s.l.) on boggy, clayey, mossy soil in montane, tropical woodland, 5 Jan. 1909, W.A. Murrill (795) (Holotype. herbarium acc. no. NY 814886, HJB1000293).
Diagnosis: Pileus conic to plane, gregarious, 2-2.5 cm, broad, 7 mm. thick; surface smooth, glabrous, incarnate-isabelline, margin straight; lamellae adnexed, nearly free, cremeous when young, soon becoming luteous, broad, ventricose; spores subellipsoid, one-sided, smooth, with one or two nuclei, very pale yellowish, 8 X 4μ; stipe crooked, cylindric, equal, smooth, ochraceous, fibrillose when young, especially at the top, 3 cm. long, 2.5 cm. thick.
Commentary: The spores are small, ellipsoid and thick-walled without an obvious germ pore (6.5–8.5 × 4.5–5.5 µm). The cheilocystidia are cylindrical; pleurocystidia were not seen. We were able to generate an ITS sequence and that together with the morphology indicate that this is a species of Pyrrhulomyces (Tian and Matheny 2021). Murrill did not mention a bitter taste and blackening context, which according to Tian and Matheny are distinctive features of the genus, but the lamellae of the exsiccate appear rather dark for a taxon that was described as having cream lamellae which change to luteous as they mature. The stipes have remained comparatively light colored (Fig. xxx). The sequence of the type is resolved in the Phyrrholomyces clade, but clearly not conspecific with either of the existing species. This is only the third species assigned to the genus Pyrrhulomyces.
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