Pseudoplagiostoma jianfenglingense Zhao X. Zhang & X. G. Zhang

Jiang, Ning, Xue, Han & Li, Yong, 2025, Species diversity of Pseudoplagiostoma and Pyrispora (Diaporthales) from Fagaceae hosts in China, IMA Fungus 16, pp. e 153782-e 153782 : e153782-

Pseudoplagiostoma jianfenglingense Zhao X. Zhang & X. G. Zhang , Fungal Diversity: 10.1007/s13225-025-00551-4 (2025)

Fig. 4

Description.

Conidiomata pycnidial, solitary, erumpent, globose, dark brown, 150–400 μm diam., exuding a dark conidial mass. Conidiophores indistinct, often reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, lageniform to ampulliform, phialidic, 11–26 × 4–6.5 μm. Conidia holoblastic, aseptate, hyaline, smooth, thick-walled, multi-guttulate, ellipsoid, oblong-cylindrical, slightly constricted at the middle, slightly curved, base tapering to a flat protruding scar, (16.5 –) 17.5–19.5 (– 20.5) × (10.5 –) 11–12.5 (– 13) μm (n = 50), L / W = 1.4–1.8, with a prominent hilum.

Culture characteristics.

Colonies on PDA flat, spreading, with flocculent aerial mycelia and even margin, forming white to smoke grey circular center area and sepia outer area, fast growing, reaching 90 mm diam. after 1 week at 25 ° C, forming dark brown conidiomata with dark conidial masses. Colonies on MEA flat, dense, surface folded, with abundant aerial mycelia and floccose margin, forming ochreous circular center area and white outer area, reaching 80 mm diam. after 2 weeks at 25 ° C, sterile. Colonies on SNA flat, spreading, with sparse aerial mycelia and undulating margin, cinnamon, slowly growing, reaching 70 mm diam. after 3 weeks at 25 ° C, sterile.

Materials examined.

CHINA • Hainan Province, Changjiang Li Autonomous County, Bawangling National Forest Park , on diseased leaves of Cyclobalanopsis patelliformis , 30 March 2019, Yong Li ( CAF 800038 ; cultures CFCC 54396 and CFCC 55894 ) .

Distribution.

China, Hainan Province.

Ecology.

Associated with leaf spot disease of Cyclobalanopsis patelliformis .

Notes.

Two isolates obtained from leaf spots of Cyclobalanopsis patelliformis formed a well-supported clade with two isolates of Pseudoplagiostoma jianfenglingense from unknown leaves (Fig. 1 ; Zhang et al. 2025). Hence, Cy. patelliformis become a new host for Ps. jianfenglingense .

Figures

Figure 1. Phylogram of Pseudoplagiostoma and Pyrispora resulting from a maximum likelihood analysis based on the ITS, LSU, RPB 2, TEF 1 - α and TUB 2 gene loci. Numbers above the branches indicate ML bootstrap values (left, ML BS ≥ 70 %) and Bayesian posterior probabilities (right, BPP ≥ 0.95). Ex-type strains are marked with *.

Figure 4. Morphology of Pseudoplagiostoma jianfenglingense (CFCC 54396): A colonies on PDA, MEA and SNA after 10 days at 25 ° C B conidioma formed on PDA C conidiogenous cells giving rise to conidia D – G conidia. Scale bars: 300 μm (B); 10 μm (C – G).