Maireella Syd. ex Maire, Annls mycol. 6(2): 145 (1908).
Index Fungorum number: IF 2981; Faceoffungi number: FoFxx, 7 morphological species (Species Fungorum, 2020), molecular data unavailable.
Parasitic on leaves of Compositae sp. Sexual morph: Ascomata dark brown to black, superficial, solitary or gregarious, globose to subglobose or pyriform, unilocular, glabrous, ostiolate. Ostiole papillate, centrally located. Peridium composed of dark brown to brown cells of textura angularis. Hamathecium composed of dense filamentous, hyaline to pale brown, septate, branched, anastomosing pseudoparaphyses. Asci 2–8-spored, bitunicate, saccate, cylindrical to fusiform, broadly rounded above, narrow below, pedicellate. Ascospores yellowish to dark brown, 1–2-seriate, 1-septate, constricted at the septum, symmetric or asymmetric, smooth and thick-walled. Asexual morph: Undetermined.
Type species: Maireella maculans Syd. ex Maire
Notes: Maireella was introduced by Maire (1908) and is typified by M. maculans. Species of Maireella are characterized by globose to pyriform, papillate ascomata, bitunicate, oblong to clavate asci and ellipsoidal, hyaline to olive-brown, 2-celled, asymmetric ascospores. Li et al. (2014) placed Maireella in Venturiaceae. Molecular data is needed to confirm this placement.