Fungalpedia – Note 2520, Arxiella
Arxiella. Papendorf.
Citation when using this data: Tennakoon DS et al. 2021 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi
Notes: Arxiella was introduced by Papendorf (1967) and typified by A. terrestris which was collected from South Africa. Three Arxiella species are listed in Species Fungorum (2021), namely A. dolichandrae, A. lunata and A. terrestris. All Arxiella species have been reported as asexual morphs, both as coelomycetes and hyphomycetes (Papendorf 1967; Ruscoe 1970; Crous et al. 2014c). Arxiella dolichandrae shows coelomycetous characters and has sporodochial, brown conidiomata on agar surface, with globose to somewhat elongated, phialidic, brown conidiogenous cells, and reniform, medianly 1-septate conidia, with guttulate, hornlike appendages at the ends (Crous et al. 2014c). Although, Arxiella terrestris and A. lunata show hyphomycetous characters and have septate, branched, hyaline to slightly olivaceous hyphae, with 1- to multi-celled, all cells conidiiferous conidiophores, and reniform, ends obliquely cornute, 1-septate, hyaline to slightly coloured conidia, on short or elongate sterigma-like projections, single or in short chains or in small irregular groups (Papendorf 1967; Ruscoe 1970). Previously, Arxiella was treated as incertae sedis (Crous et al. 2014c), but was placed in Muyocopronaceae by Crous et al. (2018). Hernandez-Restrepo et al. (2019) confirmed the Arxiella placement in Muyocopronaceae by using both morphology and phylogeny.
Type species: Arxiella terrestris Papendorf, Trans. Br. mycol. Soc. 50(1): 73 (1967).
Other accepted species: Species Fungorum – search Arxiella.
Figure 1 – Arxiella celtidis (MFLU 18-0093, holotype): a Appearance of ascomata on host. b Close-up of ascomata. c Section of an ascoma. d Section of peridium.
e Pseudoparaphyses. f–h Asci. i–l Ascospores. m Ascospore stained in Indian ink showing
a mucilaginous sheath. n A germinating ascospore. o Colony from above (on PDA). p Colony from below (on PDA). Scale bars: c = 50 μm, d = 10 μm, e–h = 10 μm, i–n = 5 μm.
References
Papendorf MC 1967 – Two new genera of soil fungi from South Africa. Trans Brit Mycol Soc 50:69–75.
Ruscoe QW 1970 – Arxiella lunata sp. nov. Trans Brit Mycol Soc 55:506–509.
Entry by
Danushka S. Tennakoon, CAS Key Laboratory for Plant Biodiversity and Biogeography of East Asia (KLPB), Kunming Institute of Botany, Chinese Academy of Science, Kunming 650201, Yunnan, People’s Republic of China , School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Plant Medicine, National Chiayi University, 300 Syuefu Road, Chiayi City 60004, Taiwan
Published online 28 May 2026