Hypomontagnella Sir, L. Wendt & C. Lamb. Mycological Progress: 1–15 (2018)

Index Fungorum number: IF 827251; MycoBank number: MB 827251Facesoffungi number: FoF 06136; 5 morphological species (Lambert et al. 2019), 2 species with sequence data.

Type species Hypomontagnella monticulosa (Mont.) Sir, L. Wendt & C. Lamb.

Notes – Lambert et al. (2019) erected Hypomontagnella to accommodate several species previously described as Hypoxylon species. Hypomontagnella differs from Annulohypoxylon and Jackrogersella by smooth perispores or with transversally striate ornamentations. It differs from species of Hypoxylon in having woody to carbonaceous stromata lacking coloured granules, papillate ostioles usually with a black annulate disc, and without apparent KOH-extractable pigments in mature stromata (Lambert et al. 2019). Cultures of all Hypomontagnella species studied so far produce the strongly antifungal polyketides of the sporothrolide type, which have never been found in any other species of Xylariales and are otherwise only known from spurious endophytes. Hypomontagnella monticulosa is illustrated in this entry (Fig. 1).

Figure 1Hypomontagnella monticulosa (Material examined – THAILAND, Naan, Doi Phu Kha, dead branch of Leucaena leucocephala (Fabaceae), 04 August 2017, MC. Samarakoon SAMC007, MFLU 18-0822, HKAS 102355, living culture MFLUCC 18-0362). a Mature stroma on bark. b Stromatal surface showing papillate and ostiolar discs (indicated by white arrows). c Stromata in vertical section. d-f Asci. g Ascospores (sigmoid germ slits indicated by white arrows). h Ascus tip in Lugol’s reagent. i, j Perispores. k, l KOH-extractable pigments. m Surface of colony. n Reverse of colony. o-q Conidiophores and conidia. Scale bars: a = 2 mm, b, c = 500 μm, d-g = 20 μm, i, j = 10 μm, o-q = 5 μm.