Fungalpedia – Note 715, Vonarxia
Vonarxia. Bat.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Figs 1,2
Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi
Epiphytic on leaves. Sexual morph: Undetermined. Asexual morph: Mycelium immersed to superficial, composed of branched to reticulate, hyaline, pale to medium brown, septate hyphae. Conidiomata pycnidial, superficial, globose, setose, membranous. Setae irregularly scattered, simple, subulate with a bulbous base, dark brown, smooth to slightly rough-walled. Conidiogenous cells aggregated, doliiform to ellipsoid, hyaline or pale brown, from the upper cell of conidioma, sympodial proliferation. Conidia filiform, hyaline, aseptate or 1-septum, subcylindrical to clavate to doliiform at the base and upper three arms subcylindrical to cylindrical, 3–10-septate (Batista et al. 1960; Crous et al. 2009; Tian et al. 2021).
Notes: Batista et al. (1960) introduced Vonarxia with the type species Vonarxia anacardii. The genus is characterized by pycnidial conidiomata, with subulate setae, doliiform to ellipsoid conidiogenous cells, sympodial proliferation, and filiform conidia with subcylindrical to doliiform base and upper three arms subcylindrical to cylindrical and multi-septate. Raj (1977) regarded Kazulia as the sexual morph of Vonarxia and later it was synonymized under Vonarxia (van der and Van Oorschot 1985; van der Aa, von Arx 1986). However, it was not supported by molecular data. Based on our phylogenetic analysis V. vagans formed a single lineage as a distinct genus in Chaetothyriaceae with 100% ML BS and 1.00 BY PP support.
Type species: Vonarxia anacardii Bat. & J.L. Bezerra, in Batista, Bezerra, Maia & Silva, Publicações Inst. Micol. Recife 283: 7 (1960)
Other accepted species: Species Fungorum – search Vonarxia.
Figures 1 – Vonarxia anacardii (18881, IMUR, holotype). a Conidioma with a seta. b Conidiogenous cells and filiform conidia. Scale bars: b = 10 μm. Redrawn from Batista et al. (1960)
Figures 2 – Phylogenetic tree generated from maximum likelihood analysis based on LSU and ITS sequence data for 273 strains representing epifoliar fungal species in Dothideomycetes, Eurotiomycetes, Lecanoromycetes and Sordariomycetes. Armillaria mellea (GLM 45831) was used as the outgroup taxon. The tree topology of the maximum-like-lihood analysis is similar to the Bayesian analysis. Bootstrap support values for maximum likelihood (ML) equal to or greater than 90% are given above or below the nodes. Branches with Bayesian poste- rior probabilities (BPP) equal to or higher than 0.90 are given above or below the nodes. The hyphen (“–”) indicates a value lower than 90% for ML BS or 0.90 for BY PP. Ex-type, holotype and ex-epitype strains are in bold. Epifoliar taxa of each clades are in red
Figures 2 – Continued.
Figures 2 – Continued.
Figures 2 – Continued.
References
Batista AC 1960 – Lembosiellina e Parasterinopsis, dois novos gêneros de Asterinaceae. Atas do Instituto de Micologia da Universidade Federal de Pernambuco 1:327.
Raj TN 1977 – Miscellaneous microfungi. II. Can J Bot 55:757–765.
Entry by
Diana Sandamali Marasinghe, 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, Mushroom Research Foundation, 128 M.3 Ban Pa Deng T. Pa Pae, A. Mae Taeng, Chiang Mai, 50150, Thailand
Published online 29 August 2023