Pyrispora quercicola Ning Jiang, 2025

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-

Pyrispora quercicola Ning Jiang sp. nov.

Fig. 7

Etymology.

Named after the host genus Quercus and “ - cola ” = “ inhabiting ”.

Diagnosis.

Distinct from Py. castaneae by the host genus.

Typus.

China • Anhui Province, Hefei City, Shushan District, Dashushan Forest Park , on diseased leaves of Quercus aliena , 2 November 2019, Dan-ran Bian (holotype CAF 800041 ; ex-type culture CFCC 54868 ) .

Description.

Conidiomata pycnidial, solitary, erumpent, globose to pulvinate, dark brown, 200–450 μm diam., exuding a brown conidial mass. Conidiophores indistinct, usually reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, pyriform base with long neck, straight or slightly curved, unbranched, phialidic, 10.5–44 × 1–2.5 μm. Conidia holoblastic, aseptate, hyaline, smooth, multi-guttulate, ellipsoidal, straight, (10.5 –) 11.5–13.5 (– 15) × 4.5–5 (– 5.5) μm (n = 50), L / W = 2.1–3.3.

Culture characteristics.

Colonies on PDA erumpent, spreading, with flocculent aerial mycelia and undulating margin, forming concentric rings, forming brown vinaceous center area and smoke gray to pale purplish gray outer area, reaching 90 mm diam. after 1 week at 25 ° C, forming dark brown conidiomata with brown conidial masses. Colonies on MEA flat, spreading, with moderate aerial mycelia and undulating margin, forming brown circular center area and buff outer area, reaching 70 mm diam. after 2 weeks at 25 ° C, sterile. Colonies on SNA flat, spreading, with sparse aerial mycelia and undulating margin, white to smoke gray, reaching 70 mm diam. after 2 weeks at 25 ° C, forming dark brown conidiomata with brown conidial masses.

Additional material examined.

China • Anhui Province, Hefei City, Shushan District, Dashushan Forest Park , on diseased leaves of Quercus aliena , 2 November 2019, Dan-ran Bian (culture CFCC 54375 ) .

Distribution.

China, Anhui Province.

Ecology.

Associated with leaf spot disease of Quercus aliena .

Notes.

Two isolates from leaf spots of Quercus aliena clustered into a well-supported clade here newly described as Pyrispora quercicola , which represents the fourth species of the genus Pyrispora and the family Pyrisporaceae (Fig. 1 ). Pyrispora quercicola is similar to Py. castaneae in conidial shape and size ( Jiang et al. 2021 a). However, they can be distinguished by the host association and the molecular phylogeny (Fig. 1 ).

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 7. Morphology of Pyrispora quercicola (CFCC 54868): A colonies on PDA, MEA and SNA after 10 days at 25 ° C B conidioma formed on PDA C – E conidiogenous cells giving rise to conidia F, G conidia. Scale bars: 300 μm (B); 10 μm (C – G).