Three new Melanoleuca species (Agaricales, Basidiomycota) from north-eastern China, supported by morphological and molecular data Pei, Ying Guo, Hong-Bo Liu, Tie-Zhi Qin, Wei-Qiang Zhao, Di Qi, Xiao-Jian Yu, Xiao-Dan MycoKeys 2021 2021-06-03 80 133 148 BAA9BA5B-CBA5-5AB1-8F35-16252AC25C77 X. D. Yu & H. B. Guo X. D. Yu & H. B. Guo 2021 Agaricomycetes Tricholomataceae Melanoleuca CoL Fungi Melanoleuca pallidorosea Agaricales 0 133 Basidiomycota species pallidorosea sp. nov.  Etymology. The epithet refers to the species which has a pallid rose pileus.  Diagnosis. The new species is distinguished from  M. grammopodiaand  M. leucopodain having a pinkish-white pileus.   Type.   China. Inner Mongolia: Xilingole League, Xiwuzhumuqin Banner, on the grass in woods,  1051 malt., 44.48°N, 117.86°E, 22 Aug 2017, X.D. Yu( holotype: SYAU-FUNGI-058).   Figure 5.  Melanoleuca pallidorosea( holotype, SYAU-FUNGI-058) Amacroscopic habit Bsurface of basidiospores. Scale bars: 1 cm( A); 2 μm( B).  Description. Pileus 30-65 mm diam., flat, with depressed centre, margin slightly undulating, expanding to uplifted, sometimes slightly lacerate when mature, surface glabrous, camel (9E8 to 10E8) at centre, pinkish-white (10A3 to 10A4) 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 x5-8 mm diam., in upper part of stipe apricot (6C8 to 6D8), becoming yellowish-brown (5E8) 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. Basidiospores (130/7/4) (6.5) 7.0-8.5 (9.0) x5.0-6.0 (6.5) μm, av. 7.4 x5.5 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) x(6.0) 6.5-9.5 (10.5) μm, av. 28 x8.5 μm, clavate, 4-spored, occasionally 2-spored, subhyaline. Hymenial cystidia absent. Lamella edge sterile. Hymenophoral trama 95-159 μmwide, regular, with thin-walled hyphae, 5.0-10.0 μmdiam., hyphae not pigmented. Subhymenium poorly developed. Pileipellis a cutis of numerous repent branched hyphae, 4.0-10.0 μmwide, inflated cell to 21.0 μm, thin-walled. Stipitipellis hyphae 7.0-10.0 μm, thin-walled, hyaline. Caulocystidia absent. Clamp connections absent.  Habit, ecology and distribution. Solitary or in small group, saprotrophic in grass. Known from north-eastern China.  Additional specimens examined.   China. Inner Mongolia: Xilingole League, Xiwuzhumuqin Banner, on the grass in woods,  1051 malt., 44.48°N, 117.86°E, 22 Aug 2017, X.D. Yu(SYAU-FUNGI-065). Chifeng City,  Bahrain Banner Saihanwula, 10 Sep 2016, T.Z. Liu& Z.L. Song(CFSZ 12136); 12 Sep 2016, T.Z. Liu& Z.L. Song(CFSZ 12253).   Figure 6.Line drawings of the three new  Melanoleucaspecies A-C  Melanoleuca chifengense( holotype, SYAU-FUNGI-059) Abasidiospores B, Cbasidia and basidioles D-G  Melanoleuca griseoflava( holotype, SYAU-FUNGI-062) Dbasidia and basidioles Ecaulocystidia Fbasidiospores Gcheilocystidia H, I  Melanoleuca pallidorosea( holotype, SYAU-FUNGI-058) Hbasidiospores Ibasidia and basidioles. Scale bars: 10 μm. 2017-08-22 X. D. Yu China 1051 44.48 Xiwuzhumuqin Banner 682 117.86 Xilingole League 1 Inner Mongolia holotype 2017-08-22 X. D. Yu, Chifeng City China 1051 44.48 Xiwuzhumuqin Banner 682 117.86 Xilingole League 1 Inner Mongolia 2016-09-10 2016-09-12 2016-09-10 T. Z. Liu, Z. L. Song Bahrain Banner Saihanwula 1