Fungalpedia – Note 2421, Neojahnula

 

Neojahnula. 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: Aliquandostipitaceae, Jahnulales, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

 

Saprobic on submerged wood. Sexual morph: Ascomata scattered or clustered in small groups, superficial, subglobose or obpyriform, brown to black, membranous, with scarcely projecting papilla, ostiolate, with few setae. Peridium thin, one-layered. Pseudoparaphyses numerous, cellular, hypha-like, hyaline, sparsely septate. Asci 8-spored, bitunicate, fissitunicate, cylindrical, sessile or short pedicellate, with an ocular chamber and faint apical ring. Ascospores uni- to bi-seriate, elongate, ellipsoidal, tapering towards the apices, brown, 1-septate, upper cell slightly wider than lower cell. Asexual morph: Undetermined.

Notes: Jahnula australiensis K.D. Hyde was collected from submerged wood in freshwater in Australia (Hyde 1993a). It was initially placed in Jahnula because the peridium comprises massive pseudoparenchymatous cells, which is the remarkable feature of Jahnula (Hyde 1993a). However, J. australiensis was shown to not belong to Jahnula sensu stricto and clustered basal to two asexual genera Brachiosphaera Nawawi and Speiropsis Tubaki with strong bootstrap support (Prihatini et al. 2008; Hyde et al. 2017; Huang et al. 2018. Jahnula australiensis is not supported in Jahnula because it has few setae surrounding the ascomata, a thin peridium comprising single row of cells, asci with an ocular chamber and faint apical ring and uni- to bi-seriate ascospores, these features are different from Jahnula. As suggested by Hyde et al. (2013), we transfer J. australiensis to a new genus, Neojahnula based on phylogenetic analyses and morphology.

 

Type species: Neojahnula australiensis (K.D. Hyde) W. Dong, H. Zhang & K.D. Hyde

Other accepted species: Species Fungorum – search Neojahnula.

 

image

 

Figure 1 – Neojahnula australiensis (MFLU 15-2711). a Ascomata on host surface. b Vertical section of ascoma. c Pseudoparaphyses. d Structure of peridium. e, f Bitunicate asci. g Ocular chamber and faint apical ring. h Ascospore. i, j Colony on PDA (up-front, down-reverse). Scale bars: b, e, f = 20 μm, c = 15 μm, d = 5 μm, g, h = 10 μm

 

References

Huang SK, Maharachchikumbura SSN, Jeewon R, Bhat DJ, Chomnunti P, Hyde KD, Lumyong S (2018) Morphological and molecular taxonomy of Jahnula dianchia sp. nov. (Jahnulales) from submerged wood in Dianchi Lake. Yunnan China. Mycol Prog 17:547–555

Hyde KD (1993a) Tropical Australian freshwater fungi. V. Bombardia sp., Jahnula australiensis sp. nov., Savoryella aquatica sp. nov. and S. lignicola. Aust Syst Bot 6:161–167

Hyde KD, Jones EBG, Liu JK, Ariyawansa H, Boehm E, Boonmee S, Braun U, Chomnunti P, Crous PW, Dai DQ, Diederich P, Dissanayake A, Doilom M, Doveri F, Hongsanan S, Jayawardena R, Lawrey JD, Li YM, Liu YX, Lücking R, Monkai J, Muggia L, Nelsen MP, Pang KL, Phookamsak R, Senanayake I, Shearer CA, Suetrong S, Tanaka K, Thambugala KM, Wijayawardene NN, Wikee S, Wu HX, Zhang Y, Aguirre-Hudson B, Alias SA, Aptroot A, Bahkali AH, Bezerra JL, Bhat DJ, Camporesi E, Chukeatirote E, Gueidan C, Hawksworth DL, Hirayama K, Hoog SD, Kang JC, Knudsen K, Li WJ, Li XH, Liu ZY, Mapook A, McKenzie EHC, Miller AN, Mortimer PE, Phillips AJL, Raja HA, Scheuer CH, Schumm F, Taylor JE, Tian Q, Tibpromma S, Wanasinghe DN, Wang Y, Xu JC, Yan JY, Yacharoen S, Zhang M 2013 – Families of Dothideomycetes. Fungal Divers 63:1–313.

Hyde KD, Norphanphoun C, Abreu VP, Bazzicalupo A, Chethana KWT, Clericuzio M, Dayarathne MC, Dissanayake AJ, Ekanayaka AH, He MQ, Hongsanan S, Huang SK, Jayasiri SC, Jayawardena RS, Karunarathna A, Konta S, Kusan I, Lee H, Li J, Lin CG, Liu NG, Lu YZ, Luo ZL, Manawasinghe IS, Mapook A, Perera RH, Phookamsak R, Phukhamsakda C, Siedlecki I, Soares AM, Tennakoon DS, Tian Q, Tibpromma S, Wanasinghe DN, Xiao YP, Yang J, Zeng XY, Abdel-Aziz FA, Li WJ, Senanayake IC, Shang QJ, Daranagama DA, de Silva NI, Thambugala KM, Abdel-Wahab MA, Bahkali AH, Berbee ML, Boonmee S, Bhat DJ, Bulgakov TS, Buyck B, Camporesi E, Castaneda-Ruiz RF, Chomnunti P, Doilom M, Dovana F, Gibertoni TB, Jadan M, Jeewon R, Jones EBG, Kang JC, Karunarathna SC, Lim YW, Liu JK, Liu ZY, Plautz HL Jr, Lumyong S, Maharachchikumbura SSN, Matocec N, McKenzie EHC, Mesic A, Miller D, Pawlowska J, Pereira OL, Promputtha I, Romero AI, Ryvarden L, Su HY, Suetrong S, Tkalcec Z, Vizzini A, Wen TC, Wisitrassameewong K, Wrzosek M, Xu JC, Zhao Q, Zhao RL, Mortimer PE (2017) Fungal diversity notes 603–708: taxonomic and phylogenetic notes on genera and species. Fungal Divers 87:1–235

Prihatini R, Boonyuen N, Sivichai S (2008) Phylogenetic evidence that two submerged-habitat fungal species, Speiropsis pedatospora and Xylomyces chlamydosporus, belong to the order Jahnulales insertae sedis Dothideomycetes. Microbiol Indones 2:136–140

 

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 21 May 2026

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