Pseudogymnoascus camphorae Zhi.Y. Zhang, Y.F. Han & Z.Q. Liang sp. nov.

Fig. 16

Etymology.

Referring to the type strains first isolated from epiphytic soil of Cinnamomum camphora (Linn) Presl.

Type.

China: Guizhou Province, Guiyang City, South Campus of Guizhou University 26°42'21"N, 106°67'13"E, epiphytic soil of C. camphora, 8 Jul 2018, Z.Y. Zhang (HMAS 351901 holotype designated here, ex-type living culture CGMCC 3.20876 = GZUIFR 22.021) .

Description.

Culture characteristics (14 d at 25 °C): Colony on PDA 20-22 mm diam., white (6A1), slightly raised, flocculent, margin irregular, localised bulge, exudates and diffusible pigments absent; reverse dark brown (6F8) to light brown (6D4) from centre to margin. Colony on MEA 20-21 mm diam., white (5A1) to yellowish-white (4A2) from centre to margin, flocculent, nearly round, margin undulated, exudates and diffusible pigments absent; reverse yellowish-brown (5E8) to orange (5A7) from centre to margin. Colony on OA 19-20 mm diam., white (13A1), slightly raised, fluffy, nearly round, margin regular, exudates absent, diffusible pigments abundant, pewter; reverse reddish (13A2).

Hyphae branched, septate, hyaline, smooth, 1.0-3.0 μm diam. Conidiophores abundant, solitary, sometimes minimally differentiated from hyphae, hyaline, smooth, arising from erect hyphae, usually bearing verticils of two to four branches at an acute angle. Aleurioconidia pyriform, obovoid, with a broad truncated basal scar, 4.0-5.5 × 3.0-3.5 µm (av. 5.2 × 3.2, n = 50). Terminal aleurioconidia at the axis obovoid, clavate or irregular, solitary or two in chains, 6.0-10.0 × 3.0-3.5 µm (av. 8.7 × 3.2 μm, n = 50), with a broad truncated basal scar. Intercalary conidia subglobose, drum, obovoid, 3.0-4.0 × 2.0-3.0 µm (av. 3.5 × 2.6 μm, n = 50), sometimes separated by connective cells that undergo rhexolysis. Arthroconidia absent. Sexual morph unknown.

Additional specimens examined.

China: Fujian Province, Xiamen City, Wuyuanbay Wetland Park 24°51'52"N, 118°17'48"E, soil, 19 Aug 2019, Z.Y. Zhang, GZUIFR 22. 22.049 .

Notes.

Pseudogymnoascus camphorae was placed as a member of clade H (Fig. 14). P. camphorae is phylogenetically related to P. zhejiangensis and P. catenatus; however, P. camphorae still forms a single clade. Morphologically, P. camphorae can be differentiated from P. catenatus by its absent arthroconidia (Zhang et al. 2021b). P. camphorae is distinguished from P. zhejiangensis by the size and shape of its aleurioconidia (pyriform, obovoid, 4.0-5.5 × 3.0-3.5 µm vs. obovoid to globose, 2.5-4.5 × 2.5-4.0 µm, respectively) and terminal aleurioconidia (obovoid, clavate or irregular, solitary or two in chains, 6.0-10.0 × 3.0-3.5 µm vs. clavate, long obovoid, 5-9 × 2.5-4 µm, respectively) (Zhang et al. 2021b).