Fungalpedia – Note 2464, Aquastroma
Aquastroma Kaz. Tanaka & K. Hiray.
Citation when using this data: Dong W et al. 2020 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Parabambusicolaceae, Pleosporales, Pleosporomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on submerged twigs of woody plant. Sexual morph: Ascomata scattered to gregarious, immersed to erumpent, depressed globose. Ostiolar neck central, compressed, with a wide ostiole. Peridium composed of pale brown, thin-walled cells. Pseudoparaphyses septate, branched and anastomosed. Asci 8-spored, bitunicate, fissitunicate, clavate, pedicellate. Ascospores clavate to fusiform, slightly curved, multiseptate, slightly constricted at septa, hyaline, smooth, with an entire sheath (Tanaka et al. 2015). Asexual morph: Undetermined.
Notes: The monotypic genus Aquastroma was introduced for a freshwater species A. magniostiolatum collected from Japan (Tanaka et al. 2015). Aquastroma fits well with the familial concept of Parabambusicolaceae and differs from other genera by its ascomata with a compressed neck and wide ostiole, and clavate to fusiform, multiseptate ascospores with an entire sheath (Tanaka et al. 2015). Aquastroma clustered within Parabambusicolaceae with high bootstrap support (Tanaka et al. 2015; Phookamsak et al. 2019). We recollected the type species A. magniostiolatum from submerged wood in Thailand.
Type species: Aquastroma magniostiolatum Kaz. Tanaka & K. Hiray.
Other accepted species: Species Fungorum – search Aquastroma.
Figure 1 – Aquastroma magniostiolata (MFLU 18-0988, new geographical record). a Appearance of ascomata immersed in host substrate. b Vertical section of ascoma. c Structure of peridium. d Pseudoparaphyses. e–h Bitunicate asci. i–l Ascospores. (l ascospore in Indian Ink). m Germinated ascospore. n Colony on PDA (from above). Scale bars: b = 50 μm, c–h = 20 μm, i–l = 10 μm, m = 30 μm.
References
Entry by
Wei Dong, Faculty of Agriculture and Food, Kunming University of Science and 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 in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Institute of Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China
Published online 15 May 2026