Melanoleuca pallidorosea 2021

Melanoleuca pallidorosea X.D. Yu & H.B. Guo, sp. nov.2021

MycoBank: 838028

Type：China. Inner Mongolia: Xilingole League, Xiwuzhumuqin Banner, on the grass in woods, 1051 m alt., 44.48°N, 117.86°E, 22 Aug 2017, X.D. Yu (holotype: SYAU-FUNGI-058). 

Description：Pileus 30–65 mm diam., flat, with depressed centre, margin slightly undulating, expanding to uplifted, sometimes slightly lacerate when mature, surface gla brous, camel at centre, pinkish-white  towards the margin. Lamellae rather distant, adnate to decurrent, white, 3.0–4.5 mm broad, with lamellulae of two lengths, but not intervening, edge entire. Stipe cylindrical, 20–50 mm long × 5–8 mm diam., in upper part of stipe apricot , becoming yellowish-brown  towards base, with whitish flocculose apex, longitudinally striate, with whitish basal tomentum. Context up to 2–5 mm thick at the pileus base, whitish to creamy, whitish in stipe cortex and base. Smell fungoid smell, taste mild. Spore print white.

Sexual morph：Basidiospores (130/7/4) (6.5) 7.0–8.5 (9.0) × 5.0–6.0 (6.5) μm, av. 7.4 × 5.5 μm, Q = (1.28)1.31–1.40(1.44), ellipsoid, hyaline, ornamentation verruculose, warts mainly round and scattered, amyloid. Basidia (20) 25–33 (35) × (6.0) 6.5–9.5 (10.5) μm, av. 28 × 8.5 μm, clavate, 4-spored, occasionally 2-spored, subhyaline. Hymenial cystidia absent. Lamella edge sterile. Hymenophoral trama 95–159 μm wide, regular, with thin-walled hyphae, 5.0–10.0 μm diam., hyphae not pigmented. Subhymenium poor ly developed. Pileipellis a cutis of numerous repent branched hyphae, 4.0–10.0 μm wide, inflated cell to 21.0 μm, thin-walled. Stipitipellis hyphae 7.0–10.0 μm, thin walled, hyaline. Caulocystidia absent. Clamp connections absent.

ASexual morph：Undetermined:

Culture: Undetermined:

Habit：Solitary or in small group, saprotrophic in grass.

Distribution：Known from north-eastern China

GenBank Accession: ITS MW258676，nrLSU MW258684，RPB2 MW281543；

ITS MW258677，nrLSU MW258687，RPB2 MW281545；

Notes: Undetermined:

Reference: [1]SX, XD, FF, Lin, & Zhang. (2014). Two new species of melanoleuca (agaricales, basidiomycota) from northeastern china, supported by morphological and molecular data. Mycoscience, 55(6), 456-461.

A macroscopic habit B surface of basidiospores. Scale bars: 1 cm (A); 2 μm (B).

H basidiospores I basidia and basidioles. Scale bars: 10 μm.