Myriangium
Myriangium Mont. & Berk., in Berkeley, London J. Bot. 4: 72 (1845).
Index Fungorum number: IF 3361; Facesoffungi number: FoF 06553, 38 morphological species (Species Fungorum 2022), 4 species with molecular data.
Saprobic on bark of Acer, Citrus, Fraxinus, and other plants. Sexual morph: Ascostromata superficial, scattered, solitary or aggregated, coriaceous to sub-carbonaceous, erumpent, dark brown to black, globose to oval, multiloculate, locules scattered throughout the ascostromata but most are concentrated at the upper region, containing only one ascus in each locule, ostiolate. Ostioles minute. Paraphyses absent. Cells of ascostromata comprising thick-walled pigmented cells of textura angularis. Asci 8-spored, bitunicate, fissitunicate, globose to subglobose, apedicellate, apically rounded with indistinct ocular chamber. Ascospores hyaline to sub hyaline, elliptical to oblong, fasciculate, muriform, usually with 4–7-transverse septa and one or more longitudinal septa, smooth walled, lacking a sheath. Asexual morph: Unknown (adapted from Dissanayake et al. 2014).
Type species: Myriangium duriaei Mont. & Berk.
Notes: Myriangium was previously accommodated in the lichen family Collemaceae by Montage and Berkeley (1845). Nylander (1854) erected the family Myriangeaceae. Myriangium is characterised by multi-loculate apothecia with asci forming in single locules (Miller 1938). Dissanayake et al. (2014) examined the type specimen and referred Myriangium to Myriangiaceae. Lumbsch and Lindemuth (2001) included Myriangium in the order Myriangiales based on LSU and SSU gene sequence data. This was followed by other authors (Schoch et al. 2009, Jayawardena et al. 2014, Hongsanan et al. 2020a). Molecular markers available for Myriangium are ITS, LSU, SSU, RPB2 and TEF-1.
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