Neomicrosphaeropsis novorossica Thambugala, Bulgakov & K.D. Hyde, sp. nov. Index Fungorum Number: IF552091

Etymology: Named after the historical name of region «Novorossiya» (in Russia), from which the host plant species had been introduced.

Holotype: MFLU 14–0603

Saprobic or weak pathogen on twigs and branches of Tamarix species. Sexual morph: Undetermined. Asexual morph: Conidiomata 60–160 μm diam. × 55–130 μm high (x = 123 × 107 μm, n = 10), pycnidial, gregarious, scattered or solitary, immersed slightly erumpent, black, globose to subglobose, uniloculate, ostiolate. Conidiomatal wall 13–34 μm (x = 21 μm, n = 15), consisting of 3–4 layers of light brown cells of textura angularis, becoming hyaline towards the conidiogenous region. Conidiogenous cells 2.6–4.2(−5.8) × 2– 3.4(−4.8) μm (x = 3.7 × 3 μm, n = 15), enteroblastic, phialidic, hyaline, cylindrical, discrete or integrated, smooth. Conidia 4.3–7.5 × 3.6–5.1 μm (x = 5.8 × 4.4 μm, n = 40), hyaline when immature, becoming light brown, aseptate, ellipsoidal, obovoid or globose, smooth-walled.

Culture characteristics: Conidia germinating on PDA with in 18 h. Colonies growing on PDA reaching 22 mm diam. after 10 days at 25 °C, circular, flat, moderately dense, surface olivaceous brown, smooth surface with entire edge.

Material examined: RUSSIA, Rostov Region, Shakhty City, Central Park, on dead branches of Tamarix ramosissima Ledeb. (Tamaricaceae), 21 May 2014, Timur Bulgakov 74 (MFLU 14–0603, holotype), ex-type living culture MFLUCC 14–0578, ICMP 20751; ibid. (GZAAS, isotype).

FIG Neomicrosphaeropsis novorossica (holotype) a Appearance of conidiomata on host surface b, c Vertical sections through conidiomata d Conidiogenous cell and developing conidium e conidia. Scale bars: b, c = 50 μm, d = 5 μm, e = 20 μm