Aquatospora

Fungalpedia – Note 2431, Aquatospora

Aquatospora. W. Dong, H. Zhang & K.D. Hyde.

Citation when using this data: Dong W et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

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

Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascomata black, scattered or gregarious, superficial, hemisphaerical to conical, base flattened, carbonaceous, with ostiolate papilla. Ostiole central, relatively broad, circular, black. Peridium uneven in width, carbonized, composed of black amorphous layer, whose cells are obscured. Pseudoparaphyses numerous, trabeculate, filiform, hyaline, sparsely septate. Asci 8-spored, bitunicate, clavate to narrowly ellipsoidal, with a short pedicel, apically rounded. Ascospores 2–4-seriate, hyaline, septate, subcylindrical, thin-walled, smooth. Asexual morph: Undetermined.

Notes: Aquatospora clusters with Acrocordiopsis Borse & K.D. Hyde and Xenoastrosphaeriella Jayasiri et al. with low bootstrap support. Acrocordiopsis is a problematic genus, which was placed in Salsugineaceae by Hyde et al. (2013) and Caryosporaceae by Ariyawansa et al. (2015). Acrocordiopsis was referred to Salsugineaceae (Wijayawardene et al. 2018, 2020) based on some common morphology between Acrocordiopsis and Salsuginea K.D. Hyde (Borse and Hyde 1989; Hyde 1991). Acrocordiopsis clustered distantly from Salsuginea in the phylogenetic tree of Zhang et al. (2018). Xenoastrosphaeriella differs from Aquatospora in having paler end cells of ascospores (Hawksworth and Boise 1985; Phookamsak et al. 2015b; Jayasiri et al. 2019). Aquatospora shares similar characters with Astrosphaeriellaceae members in having large, erumpent to superficial, hemisphaerical or conical, carbonaceous ascomata with nearly flattened bases (Borse and Hyde 1989; Ariyawansa et al. 2015; Phookamsak et al. 2015b). However, the unique combination of morphology of clavate to narrowly ellipsoidal asci, hyaline, cylindrical ascospores and molecular characters warrant Aquatospora as a new genus (more details see key to freshwater genera of Astrosphaeriellaceae).

Type species: Aquatospora cylindrica W. Dong, H. Zhang & K.D. Hyde.

Other accepted species: Species Fungorum – search Aquatospora.

Figure 1 – Aquatospora cylindrica (MFLU 18-1534, holotype). a Appearance of black ascomata on host. b, c Vertical section of ascoma. d Structure of peridium. e Pseudoparaphyses. f–h Bitunicate asci. i–k Ascospores. k Ascospore in Indian Ink. l Germinated ascospore. m, n Colony on PDA (left-front, right-reverse). Scale bars: c = 200 μm, d, f–l = 50 μm, e = 20 μm.

References

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Zhang SN, Hyde KD, Jones EBG, Cheewangkoon R, Liu JK (2018) Acuminatispora palmarum gen. et sp. nov. from mangrove habitats. Mycol Prog 17:1173–1188

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 22 May 2026

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