Clohesyomyces
Clohesyomyces K.D. Hyde, Aust. Syst. Bot. 6(2): 170 (1993)
Index Fungorum, Facesoffungi number, MycoBank, GenBank Fig 1
Classification: Lindgomycetaceae, Pleosporales, Dothideomycetes, Ascomycota, Fungi
Saprobic on submerged wood in a freshwater stream or endophytic on plants in freshwater habit. The sexual morph is undetermined. The asexual morph is characterised by the semi-immersed pycnidial conidiomata, which are dark brown to black, subperidermal, separate to aggregated, unilocular, glabrous, and globose to subglobose. The ostiole is papillate, single, circular and located in the center. The conidiomatal wall is comprised of textura angularis to textura porrecta, thick-walled and brown to pale brown cells. Conidiophores are reduced to conidiogenous cells. Conidiogenous cells are phialidic, thick- and smooth-walled, determinate, cylindrical to subcylindrical or lageniform, hyaline, and with a collarette. Conidia are hyaline, thick- and smooth-walled, guttulate, 1-septate, slightly constricted at septum, ellipsoidal, straight or slightly curved, rounded at both ends, sometimes base truncate, and enclosed by an irregular mucilaginous sheath (Li et al. 2020, Hyde 1993).
Type species: Clohesyomyces aquaticus K.D. Hyde, Aust. Syst. Bot. 6(2): 170 (1993)
Notes: Clohesyomyces was introduced by Hyde (1993) based on C. aquaticus as the type species, which was isolated from submerged wood in a freshwater stream. Zhang et al. (2012) confirmed that C. aquaticus belongs to Lindgomycetaceae (Pleosporales) based on LSU and SSU sequence data. The second species, C. symbioticus was isolated from in roots of Persicaria amphibia (Polygonaceae) growing in standing water (Arnold & Sandberg, 2021). Currently, there are two Clohesyomyces species listed in Species Fungorum (September 2024). There are more than 500 sequence data available for Clohesyomyces in GenBank (September 2024). The updated taxonomic treatment of this genus is Lindgomycetaceae, in Pleosporales (Dothideomycetes) (Wijayawardene et al. 2022, Hyde et al. 2024).
For all accepted species: see Species Fungorum, and search Clohesyomyces.
Figure 1 – Clohesyomyces aquaticus (MFLU 11–1112) a Herbarium specimen. b, c Appearance of black conidiomata on the host. d Vertical section of conidioma. e, f Section of peridium. g–j Conidiogenous cells and developing conidia. k–n Conidia. Scale bars: d = 100 µm, e =5 0 µm, f = 20 µm, g–n = 10 µm. (Originally published in Li et al. (2020) and republished with authority)
References
Arnold AE, Sandberg DC. 2021 – Clohesyomyces symbioticus sp. nov., a fungal endophyte associated with roots of water smartweed (Persicaria amphibia). Plant and Fungal Systematics 66(2), 201–210.
Hyde KD. 1993 – Tropical Australian freshwater fungi VI. Tiarosporella paludosa and Clohesymomyces aquaticus gen. et sp. nov. (Coelomycetes). Australian Systematic Botany 6, 169–173.
Zhang H, Hyde KD, Mckenzie EHC, Bahkali AH et al. 2012 – Sequence data reveals phylogenetic affinities of Acrocalymma aquatica sp. nov., Aquasubmersa mircensis gen. et sp. nov. and Clohesyomyces aquaticus (freshwater coelomycetes). Cryptogamie Mycologie 33(3), 333–346.
Entry by Chao Chen1,2,3
Edited by Kevin D. Hyde1,3 & Ishara S. Manawasinghe1
1Innovative Institute for Plant Health, College of Agriculture and Biology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, P.R. China.
2Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand.
3Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, Thailand.
Published online 2024-December 30.
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