Marcelaria Aptroot, M.P. Nelsen & Parnmen, Glalia 5(2): 3 (2013).
Index Fungorum number: IF 805450; Facesoffungi number: FoF 08803, 3 morphological species (Species Fungorum 2022), 2 species with molecular data.
= Buscalionia Sambo nom. cons. prop., Ann. Bot., Roma 22: 27 (1940). Type species: Buscalionia rubra Sambo, Ann. Bot., Roma 22: 27 (1940) [= Marcelaria purpurina (Nyl.) Aptroot, Nelsen & Parnmen].
Lichenized on host. Thallus distinctly corticate, yellow-brown to olive-green. Photobiont Trentepohlia. Sexual morph: Ascomata solitary to often crowded or loosely aggregate, prominent to sessile, brown-black but covered by thick thallus and a thick layer of yellow-orange to red pigment crystals, hemispherical to wart-shaped, coriaceous, ostiolate, ostiole apical. Excipulum prosoplectenchymatous, dark brown to carbonized. Hamathecium comprising paraphysoids, hyaline, straight, branched and anastomosing, embedded in a gelatinous matrix. Asci 2–8-spored, bitunicate, fissitunicate, oblong-clavate, short pedicellate, with a non-amyloid ocular chamber. Ascospores irregularly arranged to biseriate, fusiform-ellipsoid, hyaline, richly muriform, with somewhat thickened distosepta and rounded lumina, smooth-walled, not or slightly constricted at the septa, often with a gelatinous sheath. Asexual morph: Pycnidia unknown. Chemistry: lichexanthone sometimes produced on thallus surface; yellow to orange or red anthraquinones present on the ascomata (adapted from Hongsanan et al. 2020b).
Type species: Marcelaria purpurina (Nyl.) Aptroot, Nelsen & Parnmen
Notes: Marcelaria is characterised by solitary to often crowded or loosely aggregate ascomata, oblong-clavate, short pedicellate asci and irregularly arranged to biseriate, fusiform-ellipsoid, hyaline ascospores. The asexual morph is not known. Marcelaria has lichexanthone sometimes produced on thallus surface and yellow to orange or red anthraquinones present on the ascomata. The type species M. purpurina and other known species were recognized under different names in the genus Laurera (Aptroot et al. 2013). Aptroot and Nepi (2017) found the older name Buscalionia to be congeneric with Marcelaria and was proposed for conservation but no decision has yet been made. Marcelaria is morphologically and phylogenetically a distinct genus in Trypetheliaceae. Molecular markers available for Marcelaria include ITS, LSU, SSU, mtSSU (M. cumingii) and LSU, mtSSU (M. purpurina).
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