Fungalpedia – Note 1504, Cytostagonospora

 

Cytostagonospora. Bubák.

Index Fungorum, Facesoffungi number, MycoBank, GenBank  Fig 1

Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi

 

Saprobic on the host plant. The sexual morph is undetermined. The asexual morph is characterised by immersed pycnidial conidiomata, which are dark brown to black, amphigenous, separate, unilocular, glabrous, clypeate and globose. The ostiole is circular, depressed, papillate to shortly rostrate, situated within the clypeus and located in the center. The pycnidial wall is comprised of textura globulosa, thin-walled, dark brown cells in the basal of the wall. Conidiophores are reduced to conidiogenous cells. Conidiogenous cells are holoblastic, determinate, ampuliform to lageniform, hyaline, and smooth-walled. Conidia are hyaline, thin and smooth-walled, eguttulate, filiform, 0–2-septate, not constricted at septa, apex obtuse and base truncate (Bubák 1916, Sutton 1980, Li et al. 2020).

Notes: Cytostagonospora was introduced by Bubák (1916) based on C. photiniicola as the type species. Von Arx (1983) considered Cytostagonospora as a synonym of Septoria. However, Sutton (1980) introduced Cytostagonospora as a separate genus.  Quaedvlieg et al. (2013) confirmed that Cytostagonospora belongs to Mycosphaerellaceae (Capnodiales) based on tef-1α, tub2, rpb2, LSU and ITS datasets and the morphology of C. martiniana (Quaedvlieg et al. 2013). Species Fungorum (May 2024) lists two species (C. photiniicola and C. traversoana) in Cytostagonospora however, MycoBank (May 2024) accepts five species. Molecular data are only available for C. martiniana in NCBI (May 2024). The updated taxonomic treatment of this genus is Mycosphaerellaceae, in Mycosphaerellales (Dothideomycetes) (Wijayawardene et al. 2022, Hyde et al. 2024).

 

Type species: Cytostagonospora photiniicola Bubák [as ‘photinicola’], Annls mycol. 14(3/4): 150 (1916).

 

image

 

Figure 1 – Cytostagonospora photiniicola (redrawn from Sutton 1980) a Conidia.
b Vertical section of conidioma. c Conidiogenous cells and developing conidia. Scale bars:
a = 10 μm, b = 1300 μm, c = 10 μm. (Originally published in Li et al. (2020) and republished with authority)

 

References

Bubák F. 1916 – Achter Beitrag zur Pilzflora von Tirol. Annales Mycologici 14(3-4), 145–158.

Hyde KD, Noordeloos MT, Thiyagaraja V, He MQ et al. 2024 – The 2024 Outline of Fungi and fungus-like taxa. Mycosphere 15(1), 5146–6239.

Li WJ, McKenzie EH, Liu JK, Bhat DJ et al. 2020 – Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100, 279–801.

Quaedvlieg W, Barreto RW, Alfenas AC, Barreto RW et al. 2013 – Sizing up Septoria. Studies in Mycology 75, 307–390.

Sutton BC. 1980 – The Coelomycetes. Fungi imperfecti with pycnidia, acervuli and stromata. Commonwealth Mycological Institute, Kew.

Von Arx JA. 1983 – Mycosphaerella and its anamorphs. Proc K Nederl Wet C 86, 15–54.

Wijayawardene NN, Hyde KD, Dai DQ, Sánchez-García ML et al. 2022 – Outline of Fungi and fungus-like taxa–2021. Mycosphere 13(1), 53–453.

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