Mycocentrospora
Mycocentrospora Deighton, Taxon 21(5-6): 716 (1972).
Index Fungorum number: IF 9021; Facesoffungi number: FoF 07938, 12 morphological species (Species Fungorum 2022), 2 species with molecular data.
Leaf spot brown, often greyish in the centre and surrounded by a yellowish halo. Primary mycelium internal: hyphae more or less colorless, septate, branches. Stroma absent. Sexual morph: Unknown. Asexual morph: Conidiophores amphigenous, developing from internal mycelial hyphae which penetrate the stoma in small groups or singly and penetrate the thin cuticle between the stomata on cotyledonary leaves; they may also arise at lateral branches from repent superficial hyphae of a secondary mycelium. Conidiophores more or less colorless, smooth, thin-walled, simple or branched, septate, geniculate at the old conidial scars. Conidial scars conspicuous, at first terminal, later displaced to one side and lying at a wide angle with the axis of the conidiophore, sometimes at the end of a short protuberance (the old conidiophore apex). Conidia colorless or sometimes pale olivaceous, obclavate-acicular, smooth, pluriseptate, truncate at the base, often gradually tapering into a long narrow apical beak, straight or curved, not constricted or sometimes very slightly constricted at some of the septa, with or without a basal appendage which may be continuous but is usually septate and of variable length. Conidiophores and conidia in culture are very similar to those on natural substrata, though often longer (adapted from description of Centrospora acerina in Deighton 1971).
Type species: Mycocentrospora acerina (R. Hartig) Deighton
Notes: Mycocentrospoara was described as pseudocercospora-like in having colored secondary mycelium, conidiophores and conidia (Deighton 1971, 1973). Crous et al. (2019) included Mycocentrospoara in Dothidotthiaceae based on phylogenetic studies. Mycocentrospora differs from Phaeomycocentrospora in that the latter has conidia with filiform appendages and usually has strongly swollen intercalary cells. Deighton (1971, 1972). The type material of M. acerina is lost (Zhao et al. 2021). Zhao et al. (2021) reported that the ITS sequences of two strains (IMI 142050 and CBS 105.43) is similar to other M. acerina sequences deposited in GenBank, excluding ATCC 34539 which shows 3 bp differences. Strains of M. acerina mentioned above are sterile in culture and the authors could not designate a neotype. Fresh collections and typification of M. acerina are needed to confirm the use of the name. Mycocentrospoara is morphologically and phylogenetically a distinct genus in Dothidotthiaceae. Molecular markers available for Mycocentrospora are ITS, LSU, SSU, Actin, BTUB and TEF-1.
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