Xenoconiothyrium

Fungalpedia – Note 1674, Xenoconiothyrium

 

Xenoconiothyrium Bubák

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

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

Endophytic or saprobic on Proteaceae. The sexual morph is undetermined. The asexual morph is characterised by pycnidial conidiomata. Conidiophores are reduced to conidiogenous cells. Conidiophores are phialidic, hyaline, ampulliform and tapering to an abrupt apex. Conidia are smooth and hyaline when immature, verruculose and dark brown, 0(−1)-septate when mature, thick-walled, ellipsoid to subcylindrical, and not or constricted at the septum. Spermatia are hyaline and bacilliform (Crous et al. 2011, Wijayawardene et al. 2016).

Notes: Xenoconiothyrium was introduced by Crous et al. (2011) based on X. catenatum as the type species. This fungus was originally identified by Marincowitz et al. (2008) as Coniothyrium septatum based on the dimensions of the brown and septate conidia. Subsequently, based on LSU sequence data and the form in which the conidium appears when immature and the existence of pores, Crous et al. (2011) introduced it as a new genus and put it to Teratosphaeriaceae (Capnodiales). However, this study does not describe it in detail except that the conidiomatal type is pycnidial. Species Fungorum (September 2024) lists one Xenoconiothyrium species. There are two sequence data (SSU and LSU) available for Xenoconiothyrium in GenBank (September 2024). The updated taxonomic treatment of this genus is Teratosphaeriaceae, in Mycosphaerellales (Dothideomycetes) (Wijayawardene et al. 2022, Hyde et al. 2024).

Type species: Xenoconiothyrium catenatum Crous & Marinc. [as ‘catenata’], Persoonia 27: 42 (2011).

Other accepted species: Species Fungorum – search Xenoconiothyrium.

 

 

Figure 1 – Xenoconiothyrium catenatum (redrawn from Crous et al. 2011) a Conidiogenous cells and developing conidia. b Immature conidia as a chain. c Solitary matured conidia. Scale bars: a–c = 10 μm (Originally published in Wijayawardene et al. (2016) and republished with authority).

 

References

Crous PW, Summerell BA, Swart L, Denman S et al. 2011 – Fungal pathogens of Proteaceae. Persoonia 27, 20–45.

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.

Marincowitz S, Crous PW, Groenewald JZ, Wingfield MJ. 2008 – Microfungi occurring on Proteaceae in the fynbos. CBS Biodiversity Series 7, 1–166. CBS-KNAW Fungal Biodiversity Centre, Utrecht, Netherlands.

Wijayawardene NN, Hyde KD, Wanasinghe DN, Papizadeh M et al. 2016 – Taxonomy and phylogeny of dematiaceous coelomycetes. Fungal diversity 77, 1–316.

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.

Back to Glossary Index Page