Microdiscula
Microdiscula Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1, 124: 142 (1915)
Index Fungorum: IF 8925
Ascomycota, genera incertae sedis
Saprobic on dead stems of Rubus fruticosus (Rosaceae), and unidentified plant. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, stromatic, pycnidial, solitary to gregarious or confluent, immersed to semi-immersed, globose to subglobose, multilocular, convoluted, glabrous, ostiolate. Ostiole single, circular, papillate, centrally or laterally located. Conidiomatal wall composed of thick-walled, brown to pale brown cells of textura angularis to textura intricata. Conidiophores arising from the innermost layer wall of conidiomata, hyaline, branched septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical, integrated or discrete, determinate, smooth-walled. Conidia hyaline, cylindrical to fusiform or allantoid, unicellular, smooth-walled, eguttulate (Sutton 1980).
Type species: Microdiscula rubicola (Bres.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1, 124: 142 (1915)
Notes: Microdiscula is similar to Cytospora in having pycnidial, multilocular, convoluted, ostiolate conidiomata and phialidic, cylindrical, integrated or discrete conidiogenous cells. The main difference separating these two genera is conidial form (cylindrical to fusiform in Microdiscula, allantoid in Cytospora). Sutton (1980) re-described and illustrated the generic type M. rubicola. Another taxon M. phragmitis (Westend.) Höhn. has remained unexamined. Fresh collections are needed to better understand Microdiscula species.
Distribution: Germany (Sutton 1980).
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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