Cytospora yinchuanensis L. Lin & 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 yinchuanensis L. Lin & X. L. Fan , Studies in Mycology. 109: 393 (2024)

Fig. 9

Description.

Sexual morph: not observed. Asexual morph: Conidiomata Group AII (type a 6), immersed in bark, erumpent when mature, flat, discoid, flask-shaped to conical, with large multi-locules. Conceptacle absent. Disc light brown, circular to ovoid, 164–245 µm in diam, with one ostiole per disc. Ostiole circular to ovoid, isabelline to black, 35–45 µm. Locules subdivided frequently by invaginations with common walls, 149–299 µm. Conidiophores unbranched or branched at the bases, 13–20 × 1.5–2 (av. = 18 ± 2.3 × 1.7 ± 0.3, n = 30) µm. Conidia hyaline, unicellular, eguttulate, elongate-allantoid, 5.9–7.6 × 1.0–1.6 (av. = 6.3 ± 0.2 × 1.3 ± 0.1, n = 50) µm.

Culture characteristics.

Cultures initially white, covering the entire 6 cm Petri dish within 2 d, exhibiting radially uniform growth; no color change observed at 4 d, with mycelium becoming denser after 7 d.

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 2556 , living culture CFCC 72611 ) ; 42°23'33"N, 117°22'17"E, from branches of M. pumila , 11 September 2024, C. M. Tian, T. Q. Pei & M. H. Wang ( BJFC -S 2557 , living culture CFCC 72612 ) .

Notes.

Cytospora yinchuanensis was initially misidentified as C. schulzeri based on its numerous ostioles and erumpent pycnidia ( Fan et al. 2020) and was reported to cause canker and dieback disease. Lin et al. (2024) isolated this strain from Malus pumila in Ningxia and first described it as a new species, C. yinchuanensis , based on phylogenetic inference. In this study, two isolates ( CFCC 72611 and CFCC 72612 ) grouped together with C. yinchuanensis ( MLBP / BPP = 100 / 1.00), and their morphological characteristics are similar. Therefore, they are identified as C. yinchuanensis , representing a new host record on M. spectabilis and the first record in Hebei Province.

Figures

Figure 9. Cytospora yinchuanensis (BJFC - S 2557). 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).