Fungalpedia – Note 3252, Pseudoeutypa

 

Pseudoeutypa S.N. Zhang & E.B.G. Jones.

Citation when using this data: Zhang SN et al. 2024 – Fungalpedia.

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

Classification: Diatrypaceae, Xylariales, Xylariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi.

Etymology: Name refers to the similarity to the genus “Eutypa”.

Notes: Pseudoeutypa is characterized by poorly developed stromata, spindle-shaped asci with long stipitate, and allantoid, subhyaline, aseptate ascospores. Phylogenetically, it is distinct from other genera in Diatrypaceae. Due to taxonomic confusion around Diatrypaceae and the difficulty in segregating various genera, phylogenetic studies with more taxa sampling or based on type species are encouraged and have been used to elucidate the relations among genera (de Almeida et al. 2016). Some new genera, e.g., Allocryptovalsa (Senwanna et al. 2017), Allodiatrype (Konta et al. 2020), Neoeutypella (Phookamsak et al. 2019), Halodiatrype (Dayarathne et al. 2016), and Paraeutypella (Dissanayake et al. 2021) were subsequently introduced. We introduce a new genus Pseudoeutypa to accommodate Pseudoeutypa guttulata (= Eutypa guttulata).

In addition, three putative “Diatrypella pulvinata Nitschke” strains and one “Diatrypeaceae sp.” (Cantrell et al. 2013; Bolaños et al. 2015) also clustered with Pseudoeutypa guttulata with high support (Fig. 101; Zhang SN et al. 2024). However, Diatrypella is characterized by conical to truncate, cushion-like or discoid stromata, and usually has polysporous asci, and allantoid ascospores (Hyde et al. 2020c). The putative “Diatrypella pulvinata” strains in this clade lack morphological observations and are probably misclassified.

Type species: Pseudoeutypa guttulata (D.A.C. Almeida, Gusmão & A.N. Mill.) S.N. Zhang & E.B.G. Jones.

Other accepted species: Species Fungorum – search Pseudoeutypa.

 

 

Figure 1 – Pseudoeutypa guttulata (SNT140) a, b Ascomata on substrate. c Vertical section of an aascoma. d Ostiole with periphyses. e Peridium. f–j Asci; g Ascus stained in Melzer’s reagent. k Paraphyses. l–n Ascospores. o Germinating ascospore. p, q Colonies on PDA. Scale bars: a = 200 μm; b, c = 100 μm; d = 50 μm; e, h–j = 10 μm; f, k = 20 μm; l–n = 5 μm.

 

References

Bolaños J, De León LF, Ochoa E, Darias J et al. 2015 – Phylogenetic diversity of sponge-associated fungi from the Caribbean and the pacific of Panama and their in vitro effect on angiotensin and endothelin receptors. Mar Biotechnol 17:533–564.

Cantrell SA, Tkavc R, Gunde-Cimerman N, Zalar P et al. 2013 – Fungal communities of young and mature hypersaline microbial mats. Mycologia 105:827–836.

Dayarathne MC, Phookamsak R, Hyde KD, Manawasinghe IS et al. 2016 – Halodiatrype, a novel diatrypaceous genus from mangroves with H. salinicola and H. avicenniae spp. nov. Mycosphere 7:612–627.

de Almeida DAC, Gusmão LFP, Miller AN. 2016 – Taxonomy and molecular phylogeny of Diatrypaceae (Ascomycota, Xylariales) species from the Brazilian semi-arid region, including four new species. Mycol Prog 15:53.

Dissanayake LS, Wijayawardene NN, Dayarathne MC, Samarakoon MC et al. 2021 –Paraeutypella guizhouensis gen. et sp. nov. and Diatrypella longiasca sp. nov. (Diatrypaceae) from China. Biodiversity Data Journal 9: e63864.

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020c – Refined families of Sordariomycetes. Mycosphere 11:305–1059.

Konta S, Hyde KD, Phookamsak R, Xu JC et al. 2020a – Polyphyletic genera in Xylariaceae (Xylariales): Neoxylaria gen. nov. and Stilbohypoxylon. Mycosphere 11:2629–2651.

Phookamsak R, Hyde KD, Jeewon R, Bhat DJ et al. 2019 – Fungal diversity notes 929–1035: taxonomic and phylogenetic contributions on genera and species of fungi. Fungal Divers 95:1–273.

Senwanna C, Phookamsak R, Doilom M, Hyde KD, Cheewangkoon R. 2017 – Novel taxa of Diatrypaceae from Para rubber (Hevea brasiliensis) in northern Thailand; introducing a novel genus Allocryptovalsa. Mycosphere 8:1835–1855.

Zhang SN, Hyde KD, Jones EBG et al. 2024 – Current insights into palm fungi with emphasis on taxonomy and phylogeny. Fungal Diversity 127, 55–301.

 

Entry by

Sheng-Nan Zhang, School of Life Science and Technology, Center for Informational Biology, University of Electronic Science and Technology of China, Chengdu 611731, P.R. China., Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand., Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand.

 

Published online 18 September 2026

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