Ceuthodiplospora Died., Annls mycol. 10(2): 149 (1912)
Ascomycota, genera incertae sedis
Habit on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, stromatic, pycnidial, scattered, immersed, globose in section view, unilocular or multilocular, glabrous. Ostiole single, circular, papillate, centrally located. Conidiomatal wall composed of thick-walled, dark brown to pale brown cells of textura angularis in the base and lateral part, gradually merging with pale brown to hyaline cells in the conidial hymenium, becoming darker in the ostiolar region. Conidiophores formed from the inner wall layer of the conidiomata, reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, doliiform, determinate, smooth-walled. Conidia hyaline, cylindrical to ellipsoid, with obtuse apex and slightly truncate base, 0–1-septate, slightly constricted at the septum, smooth-walled, eguttulate (Sutton 1980).
Type species: Ceuthodiplospora robiniae (Bubák) Died., Annls mycol. 10(2): 149 (1912)
Notes: Ceuthodiplospora was described from twigs of Robinia pseudoacacia (Fabaceae), from the Czech Republic for a single species C. robiniae (Diedicke 1912). The genus has been regarded as a synonym of Cytodiplospora Oudem. (Clements and Shear 1931) and Discella Berk. & Broome (Arx 1963), but it was accepted as a separate genus by Sutton (1980). The sexual morph of C. robiniae has been assigned to Pleomassaria robiniae Bubák (1980). However, the type species of Pleomassaria, P. siparia (Berk. & Broome) Sacc. has an asexual morph, Prosthemium botulinum (type of Prosthemium) (Hantula et al. 1998, Tonolo 1956, Tanaka et al. 2005, 2010). Prosthemium species have stellate, brown, multi-septate conidia that are readily distinguished from the cylindrical to ellipsoid, hyaline, 0–1-septate conidia in Ceuthodiplospora. Therefore, Ceuthodiplospora is accepted as a distinct genus (Wijayawardene et al. 2017a, b) and is not a synonym of Pleomassaria (Index Fungorum 2019). The genus has remained monotypic and has no molecular data.
Distribution: Czech Republic (Diedicke 1912, Sutton 1980).
Ceuthodiplospora robiniae (redrawn from Sutton 1980) a Conidia. b Conidiogenous cells and developing conidia. c Vertical section of conidioma.
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