Heterosphaeriopsis
Heterosphaeriopsis Hafellner, Beih. Nova Hedwigia 62: 175 (1979).
Index Fungorum number: IF 2325; Facesoffungi number: FoF 12234, 2 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on dead wood. Sexual morph: Ascomata semi-immersed to superficial, solitary or scattered, dark brown to black, with flattened base, globose or subglobose, carbonaceous, discharging ascospores via a longitudinal slit-like opening. Peridium comprising 2-layers, outer layer composed of heavily pigmented thick-walled cells of textura angularis, inner layer composed of hyaline thin-walled cells. Pseudoparaphyses cellular, numerous. Asci 8-spored, bitunicate, fissitunicate, clavate to broadly clavate, with short, broad, furcate pedicel, thickened and rounded at apex. Ascospores 2-seriateto partially overlapping uniseriate near the base, obovoid, uniseptate, and deeply constricted at the septum, light brown to dark brown, walls smooth to verrucose. Asexual morph: unknown (adapted from Ariyawansa et al. 2014).
Type species: Heterosphaeriopsis fulvodisca (Pat.) Hafellner
Notes: Heterosphaeriopsis is characterised by semi-immersed to superficial, solitary ascomata, clavate to broadly clavate asci and obovoid, uniseptate ascospores. Lumbsch and Huhndorf (2010), Kirk et al. (2013) and Wijayawardene et al. (2017, 2020) placed Heterosphaeriopsis in Dothideomycetes, genera incertae sedis. Heterosphaeriopsis resembles members of Hysteriaceae and Patellariaceae in having hysterothecia opening via a longitudinal slit (Hyde et al. 2013). Ariyawansa et al. (2014) examined the holotype specimen of H. fulvodisca and retained Heterosphaeriopsis in Dothideomycetes, genera incertae sedis. Fresh specimen with DNA sequence data are needed to confirm the generic placement of Heterosphaeriopsis.
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