Hypomontagnella submonticulosa (Y. M. Ju & J. D. Rogers) Sir, L. Wendt & C. Lamb., 2019

Fig. 4

Teleomorph.

Stromata superficial, pulvinate to effused-pulvinate, up to 5 cm long × 0.4–2.5 cm wide, with inconspicuous perithecial mounds; surface Rust (39) to Bay (6) in young stromata, Brown Vinaceous (84) to blackish in mature stromata, shiny; blackish woody to carbonaceous tissue immediately beneath surface and between perithecia, KOH-extractable pigments pale Livid Violet (79) in young stromata, without apparent KOH-extractable pigments in mature stromata. Perithecia obovoid to spherical, 0.3–0.4 mm high × 0.25–0.35 mm wide. Ostioles higher than the stromatal surface, minutely conical papillate, surrounded by a black disc 100–152 μm diam. Asci 8 - spored, cylindrical, with amyloid, discoid apical apparatus, 1–2 µm high × 2.5–3 µm wide, stipe up to 50 µm long, and spore-bearing portion 70–85 × 6–10 µm. Ascospores brown, unicellular, ellipsoid-inequilateral, with broadly to less frequently narrowly rounded ends, 10–13 (– 14) × 4–5.5 µm, with straight germ slit less than spore-length on convex side; perispore indehiscent in 10 % KOH.

Cultures and anamorph.

Colonies on OA covering a 9 cm Petri dish in 2 weeks, at first whitish, becoming Pale Luteous (11) with sporulation, velvety, azonate to faintly zonate, with diffuse margins. Conidiogenous structure branching virgariella-like as defined by Ju and Rogers (1996). Conidiophores hyaline, smooth to finely roughened. Conidiogenous cell hyaline, smooth, 16–30 × 1.5–2 µm. Conidia hyaline, smooth to finely roughened, ellipsoid, 4–5.5 × 2.5–3.5 µm.

Secondary metabolites.

Traces of the binaphthyls hinnulin A (1) and BNT (2) in young stroma of GUM 1612 (see Fig. 3). No detectable secondary metabolites in GUM 1613.

Specimens examined.

Iran • Guilan Province, Shaft County, Babarekab forest, 37°00'27"N, 49°20'23"E, 289 m elev., on dead branches (host unknown), 15 September 2016, M. J. Pourmoghaddam (GUM 1612; living culture MUCL 57732); • Guilan Province, Talesh County, Gisoom forest, 37°39'41"N, 49°00'31"E, 500 m elev., on fallen branch of Quercus castaneifolia, 20 October 2016, M. J. Pourmoghaddam (GUM 1613).

Notes.

This specimen from our collection shares characters with the type specimen (Ju and Rogers 1996; Lambert et al. 2019), aside from insignificant variations in the size of ascospores [10–13 (– 14) × 4–5.5 vs. 9–13.5 × 4–5.8 µm]. Hypomontagnella submonticulosa was previously accommodated in Hypoxylon and recently segregated into a new genus (Lambert et al. 2019). It can be differentiated from Hypomontagnella barbarensis by its much smaller ascospores [10–13 (– 14) × 4–5.5 vs. 13–19.3 × 6.9–9.4 µm] and germ slit (straight to slightly oblique germ slit less than spore-length vs. straight, spore-length).