Diaporthe bauhiniae C.M. Tian & Q. Yang, 2021

Yang, Qin, Jiang, Ning & Tian, Cheng-Ming, 2021, New species and records of Diaporthe from Jiangxi Province, China, MycoKeys 77, pp. 41-64 : 41

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).

Figures

Figure 3. Diaporthe bauhiniae on Bauhinia purpurea (BJFC-S 1621) a habit of conidiomata in wood b transverse section of conidiomata c longitudinal section through conidiomata d the colony on PDA e conidiogenous cells attached with alpha conidia f Alpha conidia g Beta conidia. Scale bars: 100 μm (b, c); 10 μm (e-h).