Hypomontagnella
Hypomontagnella Sir, L. Wendt & C. Lambert, in Lambert, Wendt, Hladki, Stadler & Sir, Mycol. Progr. 18(1-2): 190 (2018) [2019]
Xylariomycetidae, Xylariales, Hypoxylaceae, Hypomontagnella
Index Fungorum number: IF827251; 5 morphological species (Species Fungorum 2020); 2 species with sequence data.
Saprophytic or endophytic on plant materials. Sexual morph: Stromata pulvinate to effused-pulvinate; with vinaceous surface and vinaceous purple pigments in KOH when young, brown vinaceous to blackish on maturity, with no pigment being extracted when treated with KOH; tissue under surface and in between ascomata woody or carbonaceous; with inconspicuous to conspicuous elevations where ascomata are present. Ascomata perithecial, spherical to obovoid, immersed in stroma, ostiolate. Ostioles protruding through the surface of the stroma, comprising inconspicuous to clearly visible conical papilla, encircled by a black disc. Asci 8-spored, unitunicate, cylindrical, pedicellate, with a discoid, J+, apical ring, persistent. Ascospores light brown, brown or dark brown, unicellular, ellipsoid-inequilateral, comprising broadly or narrowly rounded apices, with straight, oblique or sigmoid germ slit on the convex side throughout spore-length, nearly spore-length or less than spore-length; perispore dehiscent or indehiscent in 10% KOH, smooth or transversally striate; epispore smooth. Asexual morph: Hyphomycetous. Conidiophores hyaline to pale brown, mononematous or synnematous, smooth or rough, mostly showing virgariella-like branching patterns, seldom with nodulisporium-like branching patterns. Conidiogenesis holoblastic (adapted from Lambert et al. 2019).
Type species: Hypomontagnella monticulosa (Mont.) Sir, L. Wendt & C. Lambert, in Lambert, Wendt, Hladki, Stadler & Sir, Mycol. Progr. 18(1-2): 190 (2018) [2019]
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.
Species illustrated in this entry;
Hypomontagnella monticulosa (Mont.) Sir, L. Wendt & C. Lambert
Reference:
Lambert C, Wendt L, Hladki AI, Stadler M, Sir EB. 2019 – Hypomontagnella (Hypoxylaceae): a new genus segregated from Hypoxylon by a polyphasic taxonomic approach. Mycological Progress 18, 187–201.
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