Macrodiplodiopsis Petr., Annls mycol. 20(5/6): 343 (1922).
Index Fungorum number: IF 8809; Facesoffungi number: FoF 08292, 2 morphological species (Species Fungorum 2021), 1 species with molecular data.
Saprobic on host. Asexual morph: Mycelium immersed, branched, septate, brown. Conidiomata single or gregarious, immersed, peridermal, globose to collabent, papillate, dark brown to black, unilocular, thick-walled; outer walls of thick-walled textura porrecta, except at the base where they are of textura angularis, becoming progressively pale and more hyaline towards the conidiogenous region. Ostiole single, circular, papillate. Conidiophores reduced to conidiogenous cells. Conidiogenous cells discrete, indeterminate, cylindrical, hyaline, smooth, thick-walled, with 1–2 percurrent proliferations, formed from the inner cells of the pycnidial wall. Conidia ellipsoid to obovoid or clavate, 3-distoseptate, occasionally with a longitudinal septum, lumina very much reduced and often surrounded by dark brown wall deposits, continuous, pale brown, thick-walled, base truncate, apex obtuse, surrounded by a large gelatinous sheath. Sexual morph: Ascomata black, immersed, solitary or aggregated, globose. Asci cylindric-clavate to broadly clavate. Ascospores dark brown, obovoid with obtuse to subacute ends, straight to inequilateral, distinctly asymmetric, eudistoseptate, with an excentric primary eudistoseptum and secondary distosepta, constricted at septa, surrounded by a mucoid sheath (Adapted from Crous et al. 2015).
Type species: Macrodiplodiopsis desmazieri (Mont.) Petr.
Notes: Macrodiplodiopsis was introduced by Petrak (1922) with M. desmazieri as type species. Macrodiplodiopsis is characterized by single or gregarious conidiomata, discrete, indeterminate conidiogenous cells, ellipsoid to obovoid or clavate, 3-distoseptate conidia. The sexual morph of Macrodiplodiopsis is characterized by black, immersed ascomata, cylindric-clavate to broadly clavate asci, dark brown eudistoseptate ascospores. M. desmazieri (as Hendersonia desmazieri Mont.) was considered as the asexual morph of Massaria platani (current name: Splanchnonema platani by Shear and Davidson 1936) but this treatment was not accepted by Glawe (1985). Wijayawardene et al. (2014a) incorrectly synonymized Misturatosphaeria and Floricola under Macrodiplodiopsis but Crous et al. (2015a) reinstated the genera and described the sexual morph of M. desmazieri. Macrodiplodiopsis is a distinct and well-supported genus in its own family Macrodiplodiopsidaceae.