Polyphialoseptoria

Fungalpedia – Note 1614, Polyphialoseptoria

 

Polyphialoseptoria Quaedvl., R.W. Barreto, Verkley & Crous

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

Classification: Mycosphaerellaceae, Mycosphaerellales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

Parasitic or pathogenic on the host plant. The sexual morph is undetermined. The asexual morph is characterised by immersed to erumpent pycnidial conidiomata (acervulus in culture), which are brown, scattered to gregarious, unilocular, glabrous and globose. The ostiole is circular and located in the center. The conidiomatal wall is composed of brown to pale brown, thick-walled cells, and primarily textura angularis. Conidiophores are formed from the inner cells of the conidiomata wall, which are hyaline, septate, cylindrical, smooth-walled and branched. Conidiogenous cells are phialidic or sympodial, determinate or indeterminate, subcylindrical to ampulliform, scattered or gregarious, hyaline, and smooth-walled. Conidia are hyaline, smooth-walled, granular to guttulate, septate, scolecosporous or cylindrical to subcylindrical, apex subobtuse and base truncate (Quaedvlieg et al. 2013, Li et al. 2020).

Notes: Polyphialoseptoria was introduced by Quaedvlieg et al (2013) based on P. terminaliae as the type species, which was isolated from the leaf spot of Terminalia catappa. The second species, P. tabebuiae-serratifoliae was isolated from the leaf spot of Tabebuia serratifolia by Quaedvlieg et al. (2013). The third species, P. natalensis, was collected from an unidentified plant (Crous et al. 2018). Currently, there are three species names of Polyphialoseptoria listed in Species Fungorum (September 2024). The molecular data of tef-1α, tub2, rpb2, LSU and ITS are available for Polyphialoseptoria in GenBank (September 2024). The updated taxonomic treatment of this genus is Mycosphaerellaceae, in Mycosphaerellales (Dothideomycetes) (Wijayawardene et al. 2022, Hyde et al. 2024).

Type species: Polyphialoseptoria terminaliae Quaedvl., R.W. Barreto, Verkley & Crous 2013

 

Other accepted species: Species Fungorum – search Polyphialoseptoria.

 

 

Figure 1 – Polyphialoseptoria tabebuiae-serratifoliae (redrawn from Quaedvlieg et al. 2013) a Conidia. b Conidiogenous cells and conidiogenous loci. Scale bars: a–b = 10 μm.

 

References

Crous PW, Wingfeld MJ, Carnegie AJ, Carnegie AJ et al. 2018 – Fungal Planet description sheets: 785–867. Persoonia 41,238–417.

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.

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.

 

Entry by Chao Chen^1,2,3

Edited by Kevin D. Hyde^1,3 & Ishara S. Manawasinghe¹

 

¹Innovative Institute for Plant Health, College of Agriculture and Biology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, P.R. China.

²Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand.

³Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, Thailand.

 

Published online 2024-December 30.

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