Fungalpedia – Note 2189, Dictyoarthrinium

 

Dictyoarthrinium. S. Hughes.

Citation when using this data: Afshari N et al. 2025 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

Classification: Didymosphaeriaceae, Pleosporales, Pleosporomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

 

Dictyoarthrinium was erected by Hughes (1952), and is typified by D. quadratum. This genus has unique basauxic conidiogenous cell development; conidiophores are minutely verruculose, subhyaline and transversely septate. Conidiophore mother cells are often hyaline or pale brown and cup-shaped or subspherical. Moreover, conidia are square to spherical, subspherical or oblong, pale to dark brown, often 4-celled, and sometimes 16-celled. The surface of conidia is verruculose, and in most species have warts. The sexual morph of Dictyoarthrinium is currently unknown (Hughes 1952, Ellis 1971, Matsushima 1971, Samarakoon et al. 2020). All Dictyoarthrinium species were documented based only on morphological characters. Hyde et al. (1998) accommodated Dictyoarthrinium in Apiosporaceae (Xylariales, Sordariomycetes) based on morphological characteristics. LSU data of D. sacchari (CBS 529.73) were submitted to GenBank as the first authentic molecular record for the genus by Vu et al. (2019). Samarakoon et al. (2020) transferred Dictyoarthrinium from Apiosporaceae to Didymosphaeriaceae (Pleosporales, Dothideomycetes) according to phylogenetic analyses of combined SSU, LSU, ITS, and tef1-α sequence data. Ten species are known in this genus in Index Fungorum (2025). In this study, we introduce Dictyoarthrinium doitungensis as a novel species on woody litter of Nayariophyton zizyphifolium from Doi Tung National Park, Thailand.

 

Type species: Dictyoarthrinium quadratum S. Hughes, Mycol. Pap. 48: 30 (1952).

Other accepted species: Species Fungorum – search Dictyoarthrinium.

 

image

 

Figure 1 – Dictyoarthrinium doitungensis (MFLU 24-0462, holotype). a, b Colonies on Nayariophyton zizyphifolium woody litter. c–f Conidiophores. g–i Developing stage of immature lateral conidia. j–o Conidia. p A germinated conidium. q, r Colonies on PDA (front and reverse). Scale bars: a = 200 μm, b = 100 μm, c–f, p = 50 μm, g–i =20 μm, j–o = 10 μm.

 

References

Ellis MB. 1971 – Dematiaceous hyphomycetes; Kew, Commonwealth Mycological Institute: Kew, Surrey, England, 608.

Hughes SJ. 1952 – Fungi from the Gold Coast. I. Mycological Papers 48, 1–91.

Hyde KD, Fröhlich J, Taylor JE. 1998 – Fungi from palms XXXVI Reflections on unitunicate ascomycetes with apiospores. Sydowia 50, 21–80.

Index Fungorum. 2025 – Available online: http://www.indexfungorum.org/names/Names.asp (accessed on 10 December 2025).

Matsushima T. 1971 – Microfungi of the Solomon Islands and Papua-New Guinea. Nippon Printing Publishing Company, Osaka, 78.

Samarakoon BC, Wanasinghe DN, Samarakoon MC, Phookamsak R et al. 2020 – Multi-gene phylogenetic evidence suggests Dictyoarthrinium belongs in Didymosphaeriaceae (Pleosporales, Dothideomycetes) and Dictyoarthrinium musae sp. nov. on Musa from Thailand. MycoKeys 71, 101–118.

Vu D, Groenewald M, De Vries M, Gehrmann T et al. 2019 – Large-scale generation and analysis of filamentous fungal DNA barcodes boosts coverage for kingdom fungi and reveals thresholds for fungal species and higher taxon delimitation. Studies in Mycology 92, 135–154.

 

Entry by

Naghmeh Afshari, Department of Biology, Faculty of Sciences, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Center of Excellence in Microbial Diversity and Sustainable Utilization, Chiang Mai University, Chiang Mai 50200, Thailand

 

Published online 24 March 2026

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