Oleoguttula Selbmann & de Hoog, in Crous et al., Fungal Systematics and Evolution 3: 129 (2019).
Associated with rock. Sexual morph: Unknown. Asexual morph: Colonies black in obverse and reverse, compact, cerebriform, growing slowly, lobed with irregular margin. Hyphae pale to dark brown, branched, consisting of spherical and cylindrical cells with thick walls. Conidia abundant, produced from unicellular, micronematous, terminal or intercalary phialides with wide openings and very short collarettes. Conidia aggregating in dense clusters at phialide tips. Conidia pale to dark brown, pyriform, ovoidal, sometimes with one or two median septa (adapted from Egidi et al. 2014).
Type species: Oleoguttula mirabilis Selbmann & de Hoog
Notes: Oleoguttula was initially proposed by Selbmann & de Hoog (2014) but was invalid, and was later validated with O. mirabilis as type species. Oleoguttula is characterised by cerebriform colonies, micronematous conidiophores and pale to dark brown, pyriform conidia. Phylogenetically, Oleoguttula is a distinct and well-supported genus in Teratosphaeriaceae. Molecular markers available for Oleoguttula are ITS, LSU, BTUB and RPB2.