Fungalpedia – Note 901, Aquidictyomyces
Aquidictyomyces. W. Dong, H. Zhang & K.D. Hyde.
Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Trichosphaeriaceae, Trichosphaeriales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on submerged wood in freshwater. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies superficial, effuse, gregarious, hairy, pale brown. Mycelium mostly immersed, composed of septate, branched, pale brown, thin-walled hyphae. Conidiophores macronematous, mononematous, erect, cylindrical, straight or slightly flexuous, septate, robust at the base, unbranched, brown, paler at the apex, smooth. Conidiogenous cells holoblastic, monoblastic, integrated, determinate, terminal, subcylindrical, pale brown, smooth. Conidia acrogenous, solitary, dry, thin-walled, smooth-walled, ginger-shaped, pale brown, dictyoseptate, constricted at septa, with one primary central, longitudinal septa, with transverse or oblique septa, with some protuberances at the apex, rounded or truncate at the base, with two tapering arms curving upwards at two sides, attached fibroid, hyaline appendages.
Notes – Based on a blastn search of NCBIs GenBank, the closest hits using LSU sequence of Aquidictyomyces appendiculatus are some annulatascaceae-like genera in Diaporthomycetidae, viz. Barbatosphaeria (92.97%), Bullimyces (93.32%), Ceratolenta (93.10%) and Conlarium (92.99%). However, they can be easily distinguished by conidial shape. Our phylogenetic analysis shows that A. appendiculatus forms a distinct lineage in Diaporthomycetidae and has a weak relationship with Trichosphaeriaceae. Morphologically, A. appendiculatus does not fit with the familial concept of Trichosphaeriaceae and any of other families in Diaporthomycetidae (Hyde et al. 2020). We therefore place A. appendiculatus in a new genus Aquidictyomyces, and refer it to Diaporthomycetidae genera incertae sedis.
Type species: Aquidictyomyces appendiculatus W. Dong, H. Zhang & K.D. Hyde
Other accepted species: Species Fungorum – search Aquidictyomyces.
Figure 1 – Aquidictyomyces appendiculatus (MFLU 18-1528, holotype). a Colonies on submerged wood. b–d Conidiophores with conidia. e–g Conidia. h Germinated conidium.
i, j Colony on PDA (left-front, right-reverse). Scale bars: b, c = 10 μm, d–h = 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