Meruliopsis leptocystidiata C.C. Chen & Sheng H. Wu 2020
MycoBank MB830636
Holotype: CHINA. LIAONING PROVINCE: Anshan City, Qianshan, 40°60′N, 123°08′E, 300 m, on rotten angiosperm branch, 1 Aug 2017, S.H. Wu, Wu 1708-43 (holotype TNM F31795). GenBank: ITS = LC427013; 28S = LC427033; rpb1 = LC427070.
Morphological description
Basidiocarps up to 1 mm thick and 2.5 cm wide, annual, resupinate, effuse, adnate, membranaceous; margin up to 0.8 cm wide, slightly paler than pore surface, thinning out, usually cottony to fimbriate, sometimes rhizomorphic. Pore surface white to cream when dry; pores 4–5 per mm, round; tubes up to 125 μm deep, concolorous with pore surface; dissepiments up to 250 μm thick, entire, with continuous hymenium; subiculum thin, white. Hyphal system monomitic; hyphae simple-septate. Subicular hyphae 3–6 μm diam, strongly ramified, interwoven, colorless, thick-walled, strongly encrusted, anastomoses occasional. Tramal hyphae 2–5.5 μm diam, strongly ramified, interwoven, colorless, slightly thick- to thick-walled, anastomoses occasional. Leptocystidia 24–40 × 3.5–4.5 μm, numerous, projecting, usually cylindrical, occasionally clavate, colorless. Basidia 12–15 × 3.5–4 μm, cylindrical to clavate, 4-sterigmate. Basidiospores mostly 3–4 × 1.5–2 μm [3–4 × 1.5–2 (–2.5) μm, L = 3.45 μm, W = 1.81 μm, Q = 1.9–1.91 (n = 30) (holotype); (3–)3.5(–4) × 1.5–2(–2.5) μm, L = 3.6 μm, W = 1.9 μm, Q = 1.7–2.2 (n = 20) (SFC20180710-15); 3–3.5(–4) × 1.5–2(–2.5) μm, L = 3.2 μm, W = 1.8 μm, Q = 1.8–2 (n = 20) (SFC20160817-19)], ellipsoid, colorless, thin-walled, smooth, inamyloid, nondextrinoid, cyanophilous, usually with one oily drop.
Habitat: On rotten angiosperm branch.
Distribution: In China.
GenBank Accession:
Notes: Meruliopsis leptocystidiata resembles M. albomellea and M. variegata in having a white to cream pore surface, presence of cystidia, and similar basidiospore size. However, M. albomellea has smaller pores (5–7 per mm; Yuan et al. 2017), and M. variegata bears wider cystidia with adventitious septa (Jia et al. 2014).
Reference: Che-Chih Chen a, Chi-Yu Chen a, Young Woon Lim b et al.
Basidiocarps of Meruliopsis species in general and detailed views. A. M. leptocystidiata (Wu 1708-43, holotype). B. M. nanlingensis (Wu 0805-110). C. M. parvispora (Wu 1209-58, holotype). D. M. pseudocystidiata (Dai 1704, holotype). E. M. variegata (Li 1780, holotype). Bars = 1 mm.
