Biscogniauxia petrensis Z.F. Zhang, F. Liu & L. Cai, Persoonia 39: 11 (2017), FIGURE 3

Index Fungorum number: IF818247. Facesoffungi number: FoF 10201

Endophytic in the leaves of Dicranopteris dichotoma . Sexual morph: Undetermined. Asexual morph: Hyphae hyaline to brown, septate, branched, aerial mycelium, thin-walled. Conidiophores 4.3–7.5 μm (x = 5.5 μm, n = 22) wide, immersed or semi-immersed, macronematous, mononematous, hyaline to slightly brownish, septate, branched, slightly flexuous, finely roughened, with conidiogenous cell arising terminally or laterally. Conidiogenous cells 6.6–11.8 × 3.5–5.7 µm (x = 7.9 × 4.2 μm, n = 21), holoblastic, hyaline to light brownish, thin- and rough-walled, cylindrical to oblong, slightly swollen at the apex with conidial secession scars. Conidia 3.8–6.3 × 2.1–3.7 µm (x = 5.1 × 3.2 µm, n = 40), unicellular, hyaline, 0-septate, thin-walled, smooth, obovoid to clavate.

Culture characters: Colonies on PDA medium grow rapidly, reaching over 90 mm diameter in 7 days at 25°C, dense, circular, covered with abundant, brownish grey, cottony to woolly aerial mycelia, margin entire; reverse dark brown at center with light brown edges. Colonies on WA medium exhibit sporulation, slow growth, planar, mycelia sparse, white from above and reverse.

Known distribution and hosts: Rock in China (Zhang et al. 2017), Mnium heterophyllum in Korea (Choi et al. 2020), adult mosquitoes in Korea (Das et al. 2020), Dendrobium orchids in Thailand (Ma et al. 2020), marine algae in India (Sahoo et al. 2021), Osmanthus fragrans in China (Samarakoon et al. 2022), lichen on pine trees in South Korea (Yang et al. 2022), Dicranopteris dichotoma in China (this study).

Material examined: CHINA, Guizhou Province, Guiyang City, Guiyang Medicinal Botanical Garden, from the healthy leaves of Dicranopteris dichotoma, 13 December 2021, J. Y. Zhang, NS 50-3 (dried culture: HKAS 124929; living culture: GZCC 22–2040) .

Notes: Zhang et al. (2017) introduced and isolated Biscogniauxia petrensis from a rock in China. Subsequently, B. petrensis has been reported on various hosts, including Mnium heterophyllum (Choi et al. 2020), adult mosquitoes (Das et al. 2020), Dendrobium orchids (Ma et al. 2020), marine algae (Sahoo et al. 2021), lichen on pine trees (Yang et al. 2022), and dead branch of Osmanthus fragrans (Samarakoon et al. 2022) . Our isolate is morphologically indistinguishable from the holotype of B. petrensis (HMAS 246921) (Zhang et al. 2017). The newly obtained strain is phylogenetically clustered with three strains of Biscogniauxia petrensis (MFLUCC 14–0151, CGMCC 3.17949 and HKAS 102388) with strong statistical support (100% ML-bs/1.00 BYPP/ 100% MP-bs). Furthermore, we compared the new collection with Biscogniauxia petrensis (MFLUCC 14–0151) using single-gene data, and found similarities of 1.10% (6/554), 1.17% (12/1027), and 0.12% (1/833) in ITS, RPB2, and LSU, respectively. This study documents a new host record of Biscogniauxia petrensis in Dicranopteris dichotoma from China.