Diaporthe ukurunduensis C.M. Tian & Q. Yang

Yang, Qin, Fan, Xin-Lei, Guarnaccia, Vladimiro & Tian, Cheng-Ming, 2018, High diversity of Diaporthe species associated with dieback diseases in China, with twelve new species described, MycoKeys 39, pp. 97-149 : 97

Diaporthe ukurunduensis C.M. Tian & Q. Yang sp. nov. Figure 16

Diagnosis.

Diaporthe ukurunduensis can be distinguished from the phylogenetically closely related species D. citrichinensis in longer conidiophores and shorter alpha conidia.

Holotype.

CHINA. Shaanxi Province: Qinling Mountain, on symptomatic twigs of Acer ukurunduense , 27 June 2017, Q. Yang (holotype: BJFC-S1503; ex-type culture: CFCC 52592).

Etymology.

Named after the host species on which it was collected, Acer ukurunduense .

Description.

Conidiomata pycnidial, immersed in bark, serried, slightly erumpent through the bark surface, nearly flat, discoid, with a single locule. Ectostromatic disc dark brown to black, one ostiole per disc. Locule circular, undivided, 165-215 μm diam. Conidiophores 11.5-18 × 1.5 μm, hyaline, branched, cylindrical, straight or curved. Alpha conidia hyaline, aseptate, ellipsoidal to oval, biguttulate, 5-6 × 2.1-2.9 μm (av. = 5.5 × 2.5 μm, n = 30). Beta conidia not observed.

Culture characters.

Cultures incubated on PDA at 25 °C in darkness. Colony originally flat with white aerial mycelium, becoming brown to pale black in the centre, dense, felted, conidiomata not observed.

Additional specimens examined.

CHINA. Shaanxi Province: Qinling Mountain, on symptomatic twigs of Acer ukurunduense , 27 June 2017, Q. Yang, living culture CFCC 52593 (BJFC-S1503).

Notes.

Diaporthe ukurunduensis comprises strains CFCC 52592 and CFCC 52593 closely related to D. citrichinensis in the combined phylogenetic tree (Fig. 1). Diaporthe ukurunduensis can be distinguished from D. citrichinensis based on ITS and tef1 loci (10/470 in ITS and 4/336 in tef1).