Public Description of Rhodocybe luteocinnamomea T.J. Baroni & Ovrebo

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Name: Rhodocybe luteocinnamomea T.J. Baroni & Ovrebo
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Description status: Unreviewed

General Description:

When first collected, this species was thought to be a Clitocybe because of the decurrent gill attachment. Its stature and coloration is reminiscent of the north temperate species Clitocybe gibba (Pers.) P. Kummer. The development of the pinkish color to the lamellae and pinkish spore print, along with the microscopic spore morphology, however, place the fungus in Rhodocybe. The lack of clamp connections, central stipe, smooth pileus surface and brownish coloration places R. luteocinnamomea in section Rubrobrunnea of Rhodocybe. Within this section, it is most similar to R. piperata (Stevenson) Horak and R. pseudonitellina Dennis. Rhodocybe piperata is a larger fungus (pileus to 80 mm dia), has larger spores [6.5-10.5 × 5-7(-8.5) μm], a peppery odor and taste, and so far is only known from New Zealand. Rhodocybe pseudonitellina has adnate lamellae and globose or subglobose spores. It was described from Trinidad, West Indies. For more information on the latter two species see Baroni (1981).

https://www2.cortland.edu/dotAsset/250555.pdf


Diagnostic Description:

Basidiomata clitocyboid in stature. Pileus central region dull ochre to light cinnamon-brown (6C4; 5 YR 5/6), elsewhere light ochraceous buff to buff, occasionally light cinnamon-brown overall, not discoloring, hygrophanous, becoming slightly lighter where moisture leaves, 15-45 mm diam, no buttons seen, expanding through convex-depressed, finally plano- depressed or concave, the edge often wavy, surface dry, glabrous; context 1.5-2 mm thick, light buff, odor nondescript, taste nondescript. Lamellae buff when young, pinkish buff at maturity, not discoloring, decurrent, close, 2.5-3.5 mm diam, entire, often splitting transversely; lamellulae present and in varying lengths. Stipe yellowish buff, 25-45 mm long, 2-5 mm thick, equal, glabrous, solid, context buff. Scant whitish mycelium at base.

Spore print pinkish tan in deposit.

Basidiospores 4.5-5.5 (-6) μm × (3.5)4-4.5 (-5) μm (n = 96/7, Lm = 5.09 ± 0.30, Wm = 4.13 ± 0.29, Q = 1-1.38, Qm = 1.23 ± 0.07), subglobose or elliptic to broadly elliptic in profile and face view, tuberculate-pustulate in all views, angular or subangular in profile with 5- 7 sides, 6-9 sided in polar view, hyaline when seen singly, pale pinkish in mass, inamyloid, walls evenly cyanophilic. Basidia 19-27 × 6-7 μm, clavate, 4- sterigmate, hyaline, lacking cyanophilic bodies. Hymenial cystidia absent. Lamella trama hyaline, hyphae parallel, cylindrical, 4-12 μm diam. Hyphae of subhymenium 2-3 μm diam, cylindric. Pileipellis sordid cream yellow, repent, cylindrical hyphae, 2-5 μm diam, thin-walled, smooth or very finely encrusted Basidiomata clitocyboid in stature. Pileus central region dull ochre to light cinnamon-brown (6C4; 5 YR 5/6), elsewhere light ochraceous buff to buff, occasionally light cinnamon-brown overall, not discoloring, hygrophanous, becoming slightly lighter where moisture leaves, 15-45 mm diam, no buttons seen, expanding through convex-depressed, finally plano- depressed or concave, the edge often wavy, surface dry, glabrous; context 1.5-2 mm thick, light buff, odor nondescript, taste nondescript. Lamellae buff when young, pinkish buff at maturity, not discoloring, decurrent, close, 2.5-3.5 mm diam, entire, often splitting transversely; lamellulae present and in varying lengths. Stipe yellowish buff, 25-45 mm long, 2-5 mm thick, equal, glabrous, solid, context buff. Scant whitish mycelium at base.


Description author: Excited delirium [EXD]▼ (Request Authorship Credit)