Fungalpedia – Note 2054, Aquasubmersaceae

 

Aquasubmersaceae. A. Hashim. & Kaz. Tanaka.

Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank

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

 

Saprobic on woody plants, submerged plant substrate. Sexual morph: Ascomata scattered or grouped, semi-immersed, subglobose, with a papillate ostiolar neck. Peridium comrpises flattened, thin-walled, polygonal cells. Hamathecium comprising septate, branched, pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, with a short pedicel. Ascospores broadly fusiform with rounded ends, hyaline, septate. Asexual morph: Coelomycetous. Conidiomata pycnidial, globose to ellipsoidal, solitary or scattered, semi-immersed to superficial, dark brown to black, ostiolate. Conidiophores reduced. Conidiogenous cells holoblastic, lageniform, hyaline, smooth, formed from the inner cells of the pycnidial wall. Conidia holoblastic, ellipsoidal, hyaline, aseptate, thin- and smooth-walled, or guttulate (adapted from Zhang et al. 2012a, Hashimoto et al. 2017b)

Notes – The family was established by Hashimoto et al. (2017b), with the generic type Aquasubmersa. Based on the description of Aquasubmersa japonica provided by Ariyawansa et al. (2015a), it has 2–4.5 μm pseudoparaphyses. However, we could not see clearly from the photoplate whether it is cellular or trabeculate pseudoparaphyses. Molecular studies using LSU and SSU sequence data placed Aquasubmersa in Pleosporales (Zhang et al. 2012a, Ariyawansa et al. 2015a). Hashimoto et al. (2017b) indicated that Aquasubmersa formed a sister clade to the clade containing Lophiotremataceae Tanaka and Cryptocoryneaceae. Morphologically, Lophiotremataceae is similar to Aquasubmersaceae in having ascomata with papillate ostiolar neck and pycnidial conidiomata. However, Lophiotremataceae differs from Aquasubmersaceae in having ascomata with a compressed, slit-like ostiole. Cryptocoryneaceae and Hermatomycetaceae have sporodochial conidiomata and cheiroid or lenticular conidia, while Aquasubmersaceae has ellipsoidal conidia. Therefore, Hashimoto et al. (2017b) introduced Aquasubmersaceae to accommodate Aquasubmersa.

 

Type genus: Aquasubmersa K.D. Hyde & Huang Zhang.

 

References

Ariyawansa HA, Hyde KD, Jayasiri SC, Buyck B et al. 2015a – Fungal diversity notes 111–252—taxonomic and phylogenetic contributions to fungal taxa. Fungal Diversity 75, 27–274.

Hashimoto A, Matsumura M, Hirayama K, Tanaka K. 2017b – Revision of Lophiotremataceae (Pleosporales, Dothideomycetes): Aquasubmersaceae, Cryptocoryneaceae, and Hermatomycetaceae fam. nov. Persoonia 39, 51–73.

Zhang H, Hyde KD, Mckenzie EH, Bahkali AH, Zhou D. 2012a – Sequence data reveals phylogenetic affinities of Acrocalymma aquatica sp. nov., Aquasubmersa mircensis gen. et sp. nov. and Clohesyomyces aquaticus (freshwater coelomycetes). Cryptogamie Mycologie 33, 333–346.

 

Entry by

Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand

 

Published online 23 March 2026

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