Ascomycota, genera » Ascomycota, incertae sedis

Pseudothyrium

Pseudothyrium Höhn., in Weese, Mitt. bot. Inst. tech. Hochsch. Wien 4(3): 109 (1927)

Index Fungorum: IF 9619, MycoBank: MB 9616

Classification: incertae sedis, Ascomycota, Fungi

 

Saprobic on Bambusa sp., Polygonatum ofcinale and Maianthemum bifolium. The sexual morph is undetermined. The asexual morph is characterised by immersed conidiomata, which are pycnidial or stromatic, dark brown, solitary or rarely gregarious, subglobose and unilocular. The ostiole is indistinct and dehiscence by an irregular split in the centre of the apical wall. The conidiomatal wall is comprised of textura angularis with thick-walled, dark brown cells in the basal wall, and becomes textura prismatica with hyaline thin-walled cells in the inner layer wall. The conidiophores are reduced to conidiogenous cells. Conidiogenous cells are enteroblastic, phialidic, determinate, ampulliform and hyaline with smooth wall. Conidia are hyaline, thin- and smooth-walled, cylindrical, straight or acicular, eguttulate (Sutton 1980, Li et al. 2020).

 

Type species: Pseudothyrium polygonati (Tassi) Höhn., in Weese, Mitt. bot. Inst. tech. Hochsch. Wien 4(3): 109 (1927)

Leptothyrium polygonati Tassi, Revue mycol., Toulouse 18(no. 72): 171 (1896)

Rhabdothyrium polygonati (Tassi) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 124: 125 (1915)

Cylindrosporella polygonati (Tassi) Arx, Verh. K. ned. Akad. Wet., tweede sect. 51(3): 15 (1957)

 

Notes: Pseudothyrium was introduced by Höhn (1927) based on P. polygonati as the type species. Arx (1957) considered Pseudothyrium as a synonym of Cylindrosporella. Sutton (1980) validate this genus baed on difference in the pigment of the cuticle in Pseudothyrium and Asteroma (syn. Cylindrosporella). Currently, there is only one species listed in Pseudothyrium in Species Fungorum (May, 2024) and no sequence data available for Pseudothyrium in GenBank (May, 2024). The updated taxonomic treatment of this genus is genera incertae sedis, in Ascomycota (Wijayawardene et al. 2022).

For all accepted species: search in Species Fungorum Pseudothyrium.

 

 

Pseudothyrium polygonati (redrawn from Sutton 1980) a Vertical section of conidioma. b Conidiogenous cells and developing conidia. c Conidia. Scale bars: a = 100 μm, b–c = 10 μm. (Originally published in Li et al. (2020) and republished with authority)

 

References :

Von Arx JA. 1957 – Revision der zu Gloeosporium Gestellten Pilze. Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen 51, 1–153.

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

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

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, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, People’s Republic of 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-May 30.

 

 

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