Agaricales » Crepidotaceae » Crepidotus

Crepidotus roseocarpus

Crepidotus roseocarpus Phonemany, Thongkl. & Sysouph

Faces of fungi number: FoF 15099, MycoBank number: MB 850912

Basidiomata pleurotoid, small to medium. Pileus 15–30 × 10–45 mm; ungulate to spathuliform, flabelliform, with an inflexed margin when young and turning straight when mature; rose or pastel pink (11A5), pale red (10B6), pinkish (10A3–2); smooth or slightly fibrillose; with a split or sulcate-striate margin when mature, concolorous with surface or paler with pinkish white (11A2) when mature. Lamellae 2–4 mm wide, adnexed to sinuate, rose or pastel pink (11A5), subdistant to moderately crowded, with 45 tiers of lamellulae, smooth edge. Stipe 2 mm, present when primordial stages, cylindrical, pale red (10A4), smooth, not present in mature stages. Context 1–3 mm thick, thicker near the point of attachment then thinner toward the margin, pinkish to white (10A2–1). Odor and taste indistinct, mild. Spores print brown (6D6, 6E6).

Basidiospores [150/3/3] (5.6–)5.7–6.3–6.9(–7.5) × (5–)5.0–5.4–6.2(–6.6) µm, Q = (1.05–)1.08–1.16– 1.31(–1.34), globose to subglobose, rough or punctate, thick-walled, light brown. Basidia (13.4–)13.9–18.4–21.6(–21.6) × (5–)5.1–6.1–7.4(–7.5) µm, clavate, hyaline, smooth, thin-walled, 4-spored, with short sterigma. Cheilocystidia absent. Pleurocystidia absent. Hymenophoral trama convergent, with terminal elements (45.5–)45.5–75–93.5(–93.5) × (12.1–)12.1–17.6–20.4(–20.4) µm, hyaline, smooth, thin-walled. Pileipellis a cutis composed of cylindrical hyphae with sometimes swollen or interwoven, terminal cells cylindrical, (52.6–)52.6–76.2–111.7(–111.7) × (7.6–)7.6–10.8–13.5(–13.5) µm, hyaline, interwoven hyphae, smooth hyaline, 10–25 µm wide. Clamp connections present in pileipellis, pileus trama, and hymenophoral trama.

Habitat and distribution: — Saprobic on the bark of a living tree, scattered or fasciculate by 3–15 basidiomata. So far, this has only been found in tropical forests in northern Thailand.

Additional specimens examined: — THAILAND. Chiang Rai Province, Mae Sai District, Sala Choeng Doi, 20°16'35.4"N, 99°50'34.5"E, 3 October 2020, Monthien phonemany (MFLU23-0436), (MFLU23-0437).

Notes: — Crepidotus roseocarpus has large pastel pink basidiomata. This species easily confused marco-characteristic with C. roseus Singer recorded from Florida because of pink colour basidiomata but smaller basidiomata (4–6 mm broad), its micromorphology present cheilocystidia, and larger basidia (22–27 × 6–7 µm) (Hesler & Smith 1965). Another, similar species is marco-characteristic of Pleurotus djamor (Rumph. ex Fr.) Boedijn but P. djamor having larger basidiomata (30–70 mm diam.), thicker context (4–8 mm), margin inflexed, wavy when mature (Phonemany et al. 2021). C. cinnabarinus F.H. Møller & Westergaard recorded from Turkey was similar colour to C. roseocarpus but differs in having smaller basidiomata (5–15 mm), pileus velvety-tomentose, present fusoidventricose cheilocystidia, and clamp connections absent (Güngör et al. 2014). In phylogenetic analyses, C. roseocarpus (MFLU23-0435, MFLU23-0437) was closely related to C. thailandicus (MFLU23-0425) with strong support. However, the comparison of morphology showed a difference between both species, since C. thailandicus has a smaller basidiomata with white pileus (this study).