Diaporthe diospyrina Y.K. Bai & X.L. Fan, 2023

Bai, Yukun, Lin, Lu, Pan, Meng & Fan, Xinlei, 2023, Studies of Diaporthe (Diaporthaceae, Diaporthales) species associated with plant cankers in Beijing, China, with three new species described, MycoKeys 98, pp. 59-86 : 59

Diaporthe diospyrina Y.K. Bai & X.L. Fan sp. nov.

Fig. 3

Etymology.

Named after the host genus on which it was collected, Diospyros .

Description.

Sexual morph not observed. Asexual morph: Conidiomata pycnidial, conical, immersed in bark, scattered, erumpent through the surface, with a solitary locule. Locule undivided, 250-430 μm diam. Conidiophores cylindrical, attenuate towards the apex, hyaline, phialidic, unbranched, slightly curved, 10.0-27.0 × 0.5-2.0 μm (av. = 16.5 ± 4 × 1.3 ± 0.5 μm, n = 50). Conidiogenous cells enteroblastic, phialidic, subcylindrical to cylindrical, 4.5-8.0 × 1.0-2.0 µm (av. = 6.2 ± 1.2 × 1.3 ± 0.2 µm, n = 50). Alpha conidia hyaline, aseptate, oval, one guttulate at each end, 7.5-9.0 × 2.0-3.5 μm (av. = 8.2 ± 0.6 × 2.8 ± 0.3 μm, n = 50), L/W = 2.0-3.5 (av. = 2.7 ± 0.4, n = 50). Beta conidia not observed.

Culture characteristics.

Colonies with felty aerial mycelium initially white, growing to 80 mm after 3 days, with a uniform texture and regular edge, becoming umber after 9 days. Conidiomata black, distributed randomly at the marginal area.

Specimens examined.

China, Beijing City, Yanqing Distinct, Yeya Lake , 40°25'31.25"N, 115°51'36.34"E, from branches of Diospyros kaki , 14 Jun 2022, Y.K. Bai & X.L. Fan (holotype BJFC CF202212147, ex-type living culture: CFCC 58820; other living culture: CFCC 58821) .

Notes.

Diaporthe diospyrina and D. diospyricola were isolated from the same host genus Diospyros ( Crous et al. 2013). Although D. diospyricola only has a sequence of the ITS locus, D. diospyrina can be distinguished from D. diospyricola by ITS (20/460). Morphologically, alpha conidia of D. diospyrina (7.5-9.0 μm) are longer than D. diospyricola (5.5-7.0 μm) ( Crous et al. 2013). Therefore, the current two isolates (CFCC 58820 and 58821) were identified as a new species, D. diospyrina .

Figures

Figure 3. Diaporthe diospyrina from Diospyros kaki (BJFC CF 202212147) A, B habit of conidiomata on branch C transverse section of conidioma D longitudinal section through conidioma E conidiophores and conidiogenous cells F alpha conidia G top (left) and bottom (right) sides of colonies on potato dextrose agar (PDA) after 30 days. Scale bars: 500 μm (B, C); 250 μm (D); 10 μm (E, F).