Macroconstrictolumina Lücking, R. Miranda & Aptroot, in Hongsanan et al., Fungal Diversity: 10.1007/s13225-020-00462-6,  (2020).
Index Fungorum number: IF 836789; Facesoffungi number: FoF 08798, 4 morphological species (Species Fungorum 2022), 2 species with molecular data.
Lichenized on host. Thallus ecorticate, usually whitish. Photobiont Trentepohlia. Sexual morph: Ascomata solitary to rarely aggregate, erumpent to prominent, carbonaceous, ostiolate, ostiole apical to rarely lateral. Involucrellum carbonized. Excipulum prosoplectenchymatous, brownish to colourless below. Hamathecium comprising ca. 1 µm wide pseudoparaphyses, hyaline, straight, branched and anastomosing, embedded in a gelatinous matrix. Asci 2–8-spored, bitunicate, fissitunicate, clavate, short pedicellate, with a nonamyloid ocular chamber. Ascospores irregularly arranged to biseriate, fusiform-ellipsoid, hyaline, 1(–3)-septate, euseptate, with secondary constrictions in each cell and often with slightly thickened walls, typically granular ornamented, slightly constricted at the septum, with a gelatinous halo, medium-sized, only in one species (M. lyrata) somewhat smaller. Asexual morph: Pycnidia unknown. Chemistry: no substances detected by TLC (adapted from Hongsanan et al. 2020b).
Type species: Macroconstrictolumina malaccitula (Nyl.) Lücking, R. Miranda & Aptroot
Notes: Macroconstrictolumina is characterised by erumpent to prominent, carbonaceous, ostiolate ascomata, fissitunicate, clavate, short pedicellate asci and fusiform-ellipsoid, hyaline, 1(–3)-septate ascospores. Macroconstrictolumina accommodates members previously accommodated in Constrictolumina but are phylogenetically distinct (Aptroot and Lücking 2016; Lücking et al. 2016). Hongsanan et al. (2020b) provided four combinations M. lyrata, M. majuscule, M. megalateralis and M. malaccitula. Ascospore size and granular ornamented ascospore wall are diagnostic characters to differentiate among species of Macroconstrictolumina but more taxa need to be collected and sequenced to confirm this hypothesis. Macroconstrictolumina is a distinct and well-defined genus in Trypetheliaceae. Macroconstrictolumina needs epitypification as the type species lack sequence data and more in-depth studies are needed to confirm the taxonomic placement of this genus. Only mtSSU data is available for Macroconstrictolumina.
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