Fungalpedia – Note 893, Dictyosporella
Dictyosporella. Abdel-Aziz.
Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Annulatascaceae, Annulatascales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Dictyosporella was introduced for an aquatic hyphomycetous species D. aquatica that is characterized by dictyoseptate conidia which are helicoid when young and becoming masses of cells at maturity (Ariyawansa et al. 2015). Other three asexual species, i.e. D. ellipsoidea, D. guizhouensis and D. hydei, also have dictyoseptate conidia, but they are not helicoid when young (Song et al. 2018a, Yuan et al. 2020, this study). Dictyosporella ellipsoidea and D. guizhouensis have separating cells at the conidial base, while the other two species D. aquatica and D. hydei lack this structure.
Dictyosporella is polyphyletic as shown in our phylogenetic tree. Dictyosporella aquatica clusters with D. guizhouensis and other two sexual species D. chiangmaiensis and D. thailandensis in a well-supported clade. While, Dictyosporella hydei clusters with Junewangia aquatica and D. ellipsoidea clusters with Junewangia sphaerospora in a separated clade, which is distant from the type species D. aquatica.
Dictyosporella hydei cannot be placed in Junewangia because of the absence of macronematous conidiophores and conidiogenous cells with narrow or flaring collarette (Song et al. 2018a). Only LSU sequence data is available for D. hydei, which has one nucleotide diference with J. aquatica. Dictyosporella hydei differs from J. aquatica in having micronematous, closely packed conidiophores without percurrent proliferations, and larger, globose to broadly cylindrical conidia (22–50 × 15–26 μm vs. 17–20 × 14–18 μm) comprising multiple angular, subglobose cells (Song et al. 2018a, b). Dictyosporella ellipsoidea also morphologically does not belong in Junewangia due to its its sporodochial, punctiform colonies, dictyoseptate conidia with a separating cell, and lacking a macronematous conidiophore with percurrent proliferations (see notes under D. ellipsoidea). The relationships between the two genera Dictyosporella and Junewangia are unclear until evidence is obtained in future.
The sexual morph of Dictyosporella, D. thailandensis, was introduced based on molecular data, and characterized by annulatascaceae-like characteristics: immersed ascomata with neck erumpent through host substrate, cylindrical asci with a long pedicel and small, refractive, wedge-shaped apical ring, and fusiform, hyaline, 3-septate ascospores with filamentous bipolar appendages (Zhang et al. 2017). In this study, we introduce one new sexual morph (D. chiangmaiensis) and one new asexual morph (D. ellipsoidea) in the genus and provide a new collection for D. guizhouensis.
Type species: Dictyosporella aquatica Abdel-Aziz, in Ariyawansa et al., Fungal Diversity 75: 145 (2015)
Other accepted species: Species Fungorum – search Dictyosporella
Figure 1 – Dictyosporella chiangmaiensis (MFLU 17-1707, holotype). a–d Appearance of ascomatal necks on host. e Vertical section of ascoma. f Structure of peridium. g–l Unitunicate asci. m Paraphyses. n, o Apical rings (o in melzer’s reagent). p–u Ascospores in water. x Ascospores in melzer’s reagent. v, w Germinated ascospores. Scale bars: e = 50 μm, f, n, w = 20 μm, g–l, v = 30 μm, m, o–u, x = 15 μm.
References
Entry by
Wei Dong, Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China
Published online 15 February 2021