Diaporthe xunwuensis 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 xunwuensis C.M. Tian & Q. Yang sp. nov. Figure 9

Diagnosis.

Distinguished from the phylogenetically closely-related species D. oraccinii in having longer conidiophores and larger alpha conidia.

Etymology.

Named after the county (Xunwu) where the species was first collected.

Description.

On PDA: Conidiomata pycnidial, globose, solitary or aggregated, deeply embedded in the medium, erumpent, dark brown to black. Hyaline conidial drops exuding from ostioles. Conidiophores (18.5-)21.5-30(-32.5) × 1-1.5(-2) μm, cylindrical, hyaline, phiailidic, unbranched, straight to sinuous. Alpha conidia (6.5-)7-8.5 × 2-3 μm, aseptate, hyaline, ellipsoidal to fusiform, rounded at one end, slightly apex at the other end, usually with 2-guttulate. Beta conidia not observed.

Culture characters.

Colony at first white, becoming dark brown in the centre with age. Aerial mycelium white, dense, fluffy, with black conidial drops exuding from the ostioles.

Specimens examined.

China. Jiangxi Province: Ganzhou City, unknown dead wood, 25°45'17"N, 115°00'41"E, 23 Jul 2018, Q. Yang, Y. Liu, Y.M. Liang & C.M. Tian (holotype BJFC-C003; ex-type culture: CFCC 53085; living culture: CFCC 53086).

Notes.

Two isolates representing D. xunwuensis clustered in a well-supported clade and appear most closely related to D. oraccinii . Diaporthe xunwuensis can be distinguished from D. oraccinii , based on ITS, his3 and tef1-α loci (5/471 in ITS, 5/432 in his3 and 5/325 in tef1-α). Morphologically, D. xunwuensis differs from D. oraccinii in having longer conidiopores (21.5-30 vs. 10.5-22.5 μm) and larger alpha conidia (7-8.5 × 2-3 vs. 5.5-7.5 × 0.5-2 μm) ( Gao et al. 2016).

Figures

Figure 9. Diaporthe xunwuensis on unknown host (BJFC-S 1679) a the colony on PDA and conidiomata b alpha conidia c conidiogenous cells attached with alpha conidia. Scale bars: 10 μm (a-c).