Actidium
Actidium Fr., Observ. mycol. (Havniae) 1: 190 (1815).
Index Fungorum number: IF 58; Facesoffungi number: FoF 08102, 6 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on dead wood. Sexual morph: Ascomata hysterothecia, carbonaceous, 2–4- projections, not star-shaped to star-shaped or stellate, black, superficial, solitary or gregarious, thick-walled, distinctly navicular in outline, bearing a pronounced longitudinal slit, ellipsoid to greatly elongated. Peridium charcoal-like, carbonaceous, black, composed of small pseudoparenchymatous cells. Asci 8-spored, bitunicate, overlapping 1–2-seriate. Ascospores 1- septate, small, thin-walled, smooth or delicately longitudinally striate, rounded at the apex. Asexual morph: Unknown (adapted from Doilom et al. 2018).
Type species: Actidium hysterioides Fr.
Notes: Actidium is characterised by star-shaped or stellate hysterothecial ascomata, charcoal-like peridium, uniseptate ascospores. Molecular data is lacking for Actidium and the taxonomic placement is uncertain. Actidium may be related to other didymospored hysteriaceous genera such as Actidiographium, Glonium and Psiloglonium due to similar ascospores morphology but this needs verification. Actidium is currently placed in Mytilinidiaceae.
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