Fungalpedia – Note 796, Arxiomyces

 

Arxiomyces P.F. Cannon & D. Hawksw.

Citation when using this data: Huang SK et al. 2021 (in prep.) – Fungalpedia, Ascomycota.

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

Classification: Ceratostomataceae, Melanosporales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi

Saprobic on wood and/or isolated from soil. Sexual morph: Ascomata perithecial, gregarious, semi-immersed or erumpent through attached bark, globose to subglobose, dark brown to black, sometimes semi-translucent, glabrous or slightly hairy, ostiolate, with long necks. Asci 4- or 8-spored, unitunicate, obovoid to clavate, with long tapering pedicel, apical ring indistinct or absent, evanescent. Ascospores irregular or bi-seriate, hyaline becoming brown or dark brown, ovoid to ellipsoidal, aseptate, smooth-walled, mostly with guttules, with a rounded apex and truncated base, usually with a collapsed germ pore. Asexual morph: Undetermined (adapted from Cannon & Hawksworth 1983, Horie et al. 1986).

Notes – Arxiomyces accommodates three species, A. campanulatus, A. vitis and A. zuberiensis, and is characterized by ellipsoidal ascospores with a rounded apex and truncated base, but no molecular data is available for this genus (Cannon & Hawksworth 1982, 1983, Horie et al. 1986). These characteristics are similar to Melanospora; thus, Arxiomyces was placed in Ceratostomataceae (Cannon & Hawksworth 1982, 1983, Horie et al. 1986, Maharachchikumbura et al. 2016, Hyde et al. 2020e). 

Type species: Arxiomyces vitis (Fuckel) P.F. Cannon & D. Hawksw., Trans. Br. mycol. Soc. 81(3): 644 (1983).

Other accepted species: Species Fungorum – search Arxiomyces.

 

image

 

Figure 1 – Arxiomyces vitis: a, c, g–j, l–o, q (G-G00266143, holotype), k, p (Drawn following observation by microscope); b, d–f (NY-03380967). a Material. b Gregarious ascomata on the host. c Semi-immersed ascomata. d Ascoma with long neck. e Squashed neck. f Venter of ascoma cross section. g Hairs at base. h Neck with fasciculate cells. i Irregular cells at venter of ascoma. j–k Asci. l–q Ascospores (q stained in Melzer’s reagent). Scale bars: c–d = 500 µm, e–f = 200 µm, h = 100 µm, g = 50 µm, i–l = 20 µm, m–q = 5 µm.

 

References

Cannon PF, Hawksworth DL. 1982 – A re-evaluation of Melanospora Corda and similar Pyrenomycetes, with a revision of the British species. Botanical Journal of the Linnean Society 84(2), 115–160.

Cannon PF, Hawksworth DL. 1983 – Arxiomyces, a new name for Phaeostoma von Arx & E. Müller. Transactions of the British Mycological Society 81(3), 644–645.

Horie Y, Udagawa S-l, Cannon P. 1986 – Four new Japanese species of the Ceratostomataceae (Ascomycetes). Mycotaxon 25(1), 229–245.

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020e – Refined families of Sordariomycetes. Mycosphere, 11(1), 305–1059.

Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC et al. 2016 – Families of sordariomycetes. Fungal Diversity 79, 1–317.

 

Entry by

Shi-Ke Huang, State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China, The Engineering Research Center of Southwest Bio-Pharmaceutical Resources, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou Province, China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand, The Mushroom Research Centre, Guizhou University, Guiyang 550025, China

 

Published online 14 September 2021

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