Cytospora sorbariae A. L. Jia & X. L. Fan

Pei, Tingqian, Xiong, Dianguang & Liang, Yingmei, 2025, New species and records of Cytospora (Cytosporaceae, Diaporthales) from tree branches in Hebei Province, China, MycoKeys 126, pp. 187-212 : 187-212

Cytospora sorbariae A. L. Jia & X. L. Fan , MycoKeys 101: 184 (2024)

Fig. 8

Description.

Sexual morph: not observed. Asexual morph: Conidiomata Group AII (type a 6), immersed in the bark, scattered, erumpent through the surface of bark, with multiple locules. Conceptacle absent. Disc brown to black, circular to ovoid, erumpent through the surface of bark in a large area, conspicuous when mature, 97–241 µm in diam, with one or two ostioles per disc. Ostioles grey to black, at the same or slightly above the level of the disc surface, 60–90 µm. Locules numerous, subdivided frequently by invaginations with common walls, circular to ovoid, 160–346 µm. Conidiophores hyaline, unbranched, approximately cylindrical, 8.2–11.4 × 0.7–1.3 (av. = 9.3 ± 0.7 × 0.9 ± 0.2, n = 50) µm. Conidia hyaline, elongate-allantoid, smooth, aseptate, 3.8–6.7 × 0.9–1.6 (av. = 5.5 ± 0.7 × 1.3 ± 0.2, n = 50) µm.

Culture characteristics.

Cultures on PDA are initially white, with dense, flat, and radially even mycelial growth, growing fast up to cover the 6 cm Petri dish after 3 d, over time, the color of the strain darkens, turning tan.

Materials examined.

China, Hebei Province, Saihanba District , 42°23'33"N, 117°22'17"E, from branches of Malus spectabilis , 11 September 2024, C. M. Tian, T. Q. Pei & M. H. Wang ( BJFC -S 2555 , living culture CFCC 72609 ) .

Notes.

Cytospora sorbariae , isolated from Sorbaria sorbifolia in Beijing, was first introduced by Jia et al. (2024). Lin et al. (2024) extended its host range to Corylus heterophylla and Betula sp. In this study, CFCC 72609 clustered together with C. sorbariae with high support in the multi-gene phylogenetic tree ( MLBP / BPP = 100 / 1.00). Therefore, we identify this isolate as C. sorbariae . Meanwhile, C. sorbariae is reported for the first time on Malus spectabilis and in Hebei Province, China.

Figures

Figure 8. Cytospora sorbariae (BJFC - S 2555). A, B. Habit of conidiomata on branch; C. Transverse section through conidioma; D. Longitudinal section through conidioma; E. Conidiophores and conidiogenous cells; F. Conidia. Scale bars: 100 μm (B – D); 10 μm (E, F).