Fungalpedia – Note 2476, Ascorhombispora

 

Ascorhombispora L. Cai & K. D. Hyde

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

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

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

Saprobic on submerged bamboo. Sexual morph: Ascomata solitary or gregarious, superficial, uniloculate, globose to subglobose, dark brown to black, with ostiolate papilla. Peridium thin, comprising 2 layers of relatively thin-walled cells of textura angularis. Pseudoparaphyses absent. Asci 8-spored, bitunicate, obpyriform, broadly clavate to saccate, pedicellate, with rounded apex, deliquescent at maturity. Ascospores overlapping 2–3-seriate, broadly fusiform to rhombic, straight, 3-euseptate, not constricted at septa, median septum wide, forming a darker band, central cells large, trapezoid, dark brown to black, verruculose, thick-walled, with bipolar, small, hemispherical, subhyaline to light brown cells, surrounded by gelatinous mucilaginous sheath (Cai and Hyde 2007b). Asexual morph: Undetermined.

Notes: The monotypic genus Ascorhombispora is typified by A. aquatica L. Cai & K. D. Hyde (Cai and Hyde 2007b). The genus is characterized by globose to subglobose ascomata, obpyriform, broadly clavate to saccate, deliquescent asci without a pseudoparaphyses, and rhombic, 3-euseptate, dematiaceous ascospores with smaller, subhyaline, bipolar cells (Cai and Hyde 2007b). Ascorhombispora resembles Caryospora in having superficial ascomata, saccate asci and large dematiaceous ascospores with sheath, whereas the latter has larger, carbonaceous ascomata, numerous pseudoparaphyses, fusiform to broad-ellipsoid or biconic ascospores without subhyaline, bipolar cells (Ariyawansa et al. 2015). Phylogenetic analyses clearly separated them (Cai and Hyde 2007b; Shearer et al. 2009). Ascorhombispora is morphologically and phylogenetically not conclusively associated with any families in Pleosporales (Shearer et al. 2009). We re-examined the holotype of Ascorhombispora aquatica and did not find the verrucose ascospores mentioned in Cai and Hyde (2007b), a feature probably obvious only in fresh specimen.

Type species: Ascorhombispora aquatica L. Cai & K. D. Hyde

Other accepted species: Species Fungorum – search Ascorhombispora.

 

image

 

Figure 1 – Ascorhombispora aquatica (Material examined: CHINA, Yunnan Province, Jinghong, on submerged bamboo in a small forest stream, 26 January 2003, L. Cai, CAI-1H31, HKU(M) 10859, holotype). a Ascomata on the host surface. b Section of ascoma. c Peridium. d Ascus. e, f Ascospores. Scale bars: a = 300 µm, b, d = 50 µm, c, e, f = 30 µm.

 

References

Ariyawansa HA, Hyde KD, Jayasiri SC, Buyck B, Chethana KWT, Dai DQ, Dai YC, Daranagama DA, Jayawardena RS, Lucking R, Ghobad-Nejhad M, Niskanen T, Thambugala KM, Voigt K, Zhao RL, Li GJ, Doilom M, Boonmee S, Yang ZL, Cai Q, Cui YY, Bahkali AH, Chen J, Cui BK, Chen JJ, Dayarathne MC, Dissanayake AJ, Ekanayaka AH, Hashimoto A, Hongsanan S, Jones EBG, Larsson E, Li WJ, Li QR, Liu JK, Luo ZL, Maharachchikumbura SSN, Mapook A, McKenzie EHC, Norphanphoun C, Konta S, Pang KL, Perera RH, Phookamsak R, Phukhamsakda C, Pinruan U, Randrianjohany E, Singtripop C, Tanaka K, Tian CM, Tibpromma S, Abdel-Wahab MA, Wanasinghe DN, Wijayawardene NN, Zhang JF, Zhang H, Abdel-Aziz FA, Wedin M, Westberg M, Ammirati JF, Bulgakov TS, Lima DX, Callaghan TM, Callac P, Chang CH, Coca LF, Dal-Forno M, Dollhofer V, Fliegerova K, Greiner K, Griffith GW, Ho HM, Hofstetter V, Jeewon R, Kang JC, Wen TC, Kirk PM, Kytovuori I, Lawrey JD, Xing J, Li H, Liu ZY, Liu XZ, Liimatainen K, Lumbsch HT, Matsumura M, Moncada B, Nuankaew S, Parnmen S, Santiago A, Sommai S, Song Y, de Souza CAF, de Souza-Motta CM, Su HY, Suetrong S, Wang Y, Wei SF, Yuan HS, Zhou LW, Reblova M, Fournier J, Camporesi E, Luangsa-ard JJ, Tasanathai K, Khonsanit A, Thanakitpipattana D, Somrithipol S, Diederich P, Millanes AM, Common RS, Stadler M, Yan JY, Li XH, Lee HW, Nguyen TTT, Lee HB, Battistin E, Marsico O, Vizzini A, Vila J, Ercole E, Eberhardt U, Simonini G, Wen HA, Chen XH, Miettinen O, Spirin V, Hernawati H 2015 – Fungal diversity notes 111–252-taxonomic and phylogenetic contributions to fungal taxa. Fungal Divers 75:27–274.

Cai L, Hyde KD 2007b – Ascorhombispora aquatica gen. et sp. nov. from a freshwater habitat in China, and its phylogenetic placement based on molecular data. Cryptogam Mycol 28:291–300.

Shearer CA, Raja HA, Miller AN, Nelson P, Tanaka K, Hirayama K, Marvanová L, Hyde KD, Zhang Y 2009 – The molecular phylogeny of freshwater Dothideomycetes. Stud Mycol 64:145–153.

 

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

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