Nigropunctata Samarak. & K.D. Hyde, in Samarakoon, Hyde, Maharachchikumbura, Stadler, Gareth Jones, Promputtha, Suwannarach, Camporesi, Bulgakov & Liu, Fungal Diversity 112: 68 (2022)
Xylariomycetidae, Xylariales genus incertae sedis, Nigropunctata
Index Fungorum number: IF 558737; Facesoffungi number: FoF 10218; 3 morphological species; 3 species with sequence data.
Saprobic on dead bamboo branches. Sexual morph: Ascomata immersed, raised, visible as black dots, solitary or aggregated, in cross-section globose to subglobose. Ostioles centric or eccentric, ostiolar canal periphysate, flattened at top, covered with a black, thick clypeus. Ectostroma yellow to brown. Peridium easily detached from host tissues, with two cell layers, outer layer thick, comprising brown, thick-walled cells of textura angularis, inner layer thin, composed of hyaline, thin-walled cells of textura angularis. Paraphyses long, numerous, filamentous, septate, rarely branched, constricted at septa, guttulate, apically blunt, embedded in a gelatinous matrix. Asci 8-spored, unitunicate, cylindrical, short-pedicellate, apically rounded, with a discoid, or inverted, hat-shaped, apical ring, J + in Melzer’s reagent. Ascospores uniseriate or overlapping uniseriate, brown to dark brown, cylindrical to broadly ellipsoidal, aseptate, 1–2-guttulate, covered with a thick mucilaginous sheath or sheath lacking, germ slit on the ventral side, straight, along the entire spore length. Asexual morph: Undetermined (copied from Samarakoon et al. 2022).
Type species: Nigropunctata bambusicola Samarak. & K.D. Hyde, in Samarakoon, Hyde, Maharachchikumbura, Stadler, Gareth Jones, Promputtha, Suwannarach, Camporesi, Bulgakov & Liu, Fungal Diversity 112: 68 (2022)
Notes: Anthostomella-like taxa are polyphyletic in Xylariales with diversified morphologies (Lu and Hyde 2000). Several morpho-molecular studies have introduced anthostomella-like taxa as new genera in an attempt to resolve the polyphyletic nature of Anthostomella (Daranagama et al. 2015, 2016a; Konta et al. 2021). Lu and Hyde (2000) emphasised that the position and morphology of ascomata, presence or absence, and shape of the J + /J−, apical ring and ascospore morphology, play a vital role in identifying Anthostomella species. However, the type species has not yet been designated formally (proposed A. limitata and A. tomicoides) and sequenced to provide a phylogenetic affinity (Voglmayr et al. 2018). However, based on morphology, Nigropunctata does not fit with either A. limitata or A. tomicoides. Nigropunctata species have immersed ascomata with a thick clypeus; white or yellow ectostroma, cylindrical, short pedicel, apically rounded asci with J + , discoid or inverted, hat-shaped, apical ring and cylindrical to broadly ellipsoidal, aseptate, ascospores with a germ slit, which excludes it from Anthostomella. In addition, all Nigropunctata species introduced in the study by Samarakoon et al. (2022) occur on dead bamboo. The multigene phylogeny conducted by Samarakoon et al. (2022) also reveals that Nigropunctata clusters independently in Xylariales (Fig. 1; Clade Xy26) (copied from Samarakoon et al. 2022).
Species illustrated in this entry:
Nigropunctata bambusicola Samarak. & K.D. Hyde
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