Diaporthe bauhiniae C.M. Tian & Q. Yang sp. nov. Figure 3

Diagnosis.

Distinguished from the phylogenetically closely-related species D. psoraleae-pinnatae in alpha and beta conidia.

Etymology.

Named after Bauhinia, the host genus where the fungus was isolated.

Description.

Conidiomata pycnidial, immersed in bark, scattered, slightly erumpent through bark surface, nearly flat, discoid, with a solitary undivided locule. Ectostromatic disc grey to brown, one ostiole per disc. Locule circular, undivided, (180-)200-290(-300) μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, cylindrical, unbranched, straight, tapering towards the apex. Alpha conidia hyaline, aseptate, ellipsoidal to fusiform, biguttulate to multi-guttulate, (7.5-)9-13(-14) × (1.5-)2-2.5(-3) μm . Beta conidia hyaline, aseptate, filiform, straight to sinuous, eguttulate, (25-)28.5-40(-43) × 1 µm .

Culture characters.

Colony at first white, becoming wine-red in the centre with age. Aerial mycelium white, dense, fluffy, conidiomata absent.

Specimens examined.

China. Jiangxi Province: Ganzhou City, on branches of Bauhinia purpurea, 25°52'21"N, 114°56'44"E, 11 May 2018, Q. Yang, Y. Liu & Y.M. Liang (holotype BJFC-S1621; ex-type living culture: CFCC 53071; living culture: CFCC 53072 and CFCC 53073).

Notes.

Three isolates representing D. bauhiniae cluster in a well-supported clade and appear most closely related to D. psoraleae-pinnatae . Diaporthe bauhiniae can be distinguished from D. psoraleae-pinnatae, based on ITS and tub2 (38/458 in ITS and 11/418 in tub2). Morphologically, D. bauhiniae differs from D. psoraleae-pinnatae in having narrower alpha conidia (2-2.5 vs. 2.5-3 μm) and the beta conidia of D. psoraleae-pinnatae were not observed (Crous et al. 2013).