Cryptosporella betulae (Tul. & C. Tul.) L. C. Mejía & Castl.

Wang, Caixia, Jiang, Ning, Liu, Chuli, Xu, ZiYan, Lu, Hailong & Ma, Rong, 2025, Morphology and molecular phylogeny reveal new species and records of Diaporthales from Betula in Xinjiang, China, MycoKeys 125, pp. 167-204 : 167-204

Cryptosporella betulae (Tul. & C. Tul.) L. C. Mejía & Castl. , Mycol. Res. 112 (1): 32 (2008)

Fig. 10

Description.

Conidiomata acervular, immersed to semi-immersed in the bark, scattered, conical, 850–1200 μm diam., 650–800 μm high. Central column beneath the disc more or less conical, grey to black. Ectostromatic disc brown, circular to ovoid, 350–420 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells narrowly cylindrical, smooth, hyaline, producing a conidium at apex, (6 –) 8–10.5 (– 13) × (3 –) 4.5–6.5 (– 8) μm. Conidia hyaline, aseptate, cylindrical to clavate, curved, (52 –) 55.5–66.5 (– 70) × (4.5 –) 5.5–6.5 μm (av. = 61 ± 5.2 × 5.8 ± 0.6 μm, n = 50) μm, L / W ratio = 9.1–11.9.

Culture characteristics.

Colonies on PDA flat, spreading, with moderate aerial mycelium and even margin, white to fawn, reaching 70 mm diam. after 2 weeks at 25 ° C, sterile.

Materials examined.

China • Xinjiang Uygur Autonomous Region, Altay Prefecture, Altay City, Alahake Town, Haxionggou Valley , from branches of Betula pendula , 7 October 2024, Rong Ma, Caixia Wang & Hailong Lu ( XJAU 4059 cultures CFCC 71654 and CFCC 71655 ) ; ibid. ( XJAU 4060 , cultures CFCC 71656 , CFCC 71657 and CFCC 71658 ) .

Notes.

The species concept of Cryptosporella betulae was conceived more narrowly than previous studies, with only the sexual morph described ( Mejía et al. 2008, 2011). This fungus has been recorded in Austria and Russia inhabiting Betula lenta and B. pendula ( Mejía et al. 2008, 2011). In this study, two new specimens collected from Xinjiang, China and five isolates were obtained. They were identified as Cr. Betulae , based on the molecular phylogeny (Fig. 5 ), representing a new host record in China. In addition, asexual morph of this fungus is firstly discovered and described herein.

Figures

Figure 5. Maximum Likelihood tree of Cryptosporella generated from combined ITS, tef 1 and tub 2 sequence data. Bootstrap support values ≥ 50 % and Bayesian posterior probabilities ≥ 0.90 are demonstrated at the branches. Ex-type strains are marked in bold.

Figure 10. Morphology of Cryptosporella betulae from Betula pendula. A – C. Habit of conidiomata on branch; D. Transverse section through conidiomata; E. Longitudinal section through conidiomata; F. Conidiophores and conidiogenous cells; G. Conidia. Scale bars: 500 μm (B – E); 10 μm (F, G).