Acrogenotheca
Acrogenotheca Cif. & Bat., in Batista & Ciferri, Saccardoa 2: 51 (1963).
Index Fungorum number: IF 49; Facesoffungi number: FoF 07913, 3 morphological species (Species Fungorum 2022), no molecular data available.
Epiphytes, appearing as black colonies of rounded darkened areas on leaves. Thallus very thin, superficial, comprising neatly or irregularly arranged, cylindrical to cuboid cells, with brown to dark brown walls, mycelium composed of two types, one is stoloniferous, interwoven, brown, thick-walled, giving rise to second kind of upright hyphae which are monopodially branched, brownish-black, without setae, mother hyphae growing up, at an angle with fertile hyphae. Sexual morph: Thyriothecia developing under thallus tissue, globose to subglobose, flattened, with a porate, central ostiole, peridium very thin. Hamathecium lacking pseudoparaphyses. Asci 4–8-spored, bitunicate, fissitunicate, clavate, broader at the centre, short pedicellate or apedicellate, apically rounded with ocular chamber. Ascospores 2–3-seriate, fusoid to clavate, 1–3-septate, constricted at septa, hyaline to pale brown, smooth-walled. Asexual morph: Pycnidia intercalary or sometimes on branches, subglobose to ovoid, dark brown, pseudo-ostiolate, with polygonal cells. Pycnospores hyaline, multi-transversely septate, not constricted, brown, connected with the mycelia hyphae through the short peduncle (adapted from Hongsanan et al. 2014).
Type species: Acrogenotheca pulcherrima Bat. & Cif.
Notes: Acrogenotheca is characterised by superficial brown to dark brown thallus, globose to subglobose, flattened thyriothecia, fissitunicate, clavate asci and fusoid to clavate, 1–3-septate ascospores. Acrogenotheca differs from Trichopeltina in having clavate asci and clavate, 3-celled, greyish brown ascospores. Hongsanan et al. (2014) re-examined the type material of A. pulcherrima (URM 11037) and placed Acrogenotheca in Trichopeltinaceae based on morphology especially greyish brown, clavate and 3-celled ascospores and clavate asci. Hongsanan et al. (2014) reported asexual fructifications that formed on the thallus but could not prove the relationship with A. pulcherrima. Acrogenotheca is morphologically a distinct genus in Trichopeltinaceae but fresh collections and molecular data are needed to confirm this taxonomic placement.
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