Fungalpedia – Note 835, Euacanthe
Euacanthe. Theiss.
Citation when using this data: Huang SK et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Nitschkiaceae, Coronophorales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on wood. Sexual morph: Subiculum composed of numerous, brown to dark brown, branched, septate hyphae, with dichotomously branched, tapering ends. Ascomata densely gregarious, superficial, sitting on a subiculum, coriaceous, black, turbinate, cupuliform to subglobose, the apex collapsing when dry, tuberculate, with spiculate, erect setae, lacking ostioles, with a central, conical Quellkörper. Peridium composed of membranaceous, brown to hyaline cells of textura angularis to textura prismatica, Munk pores present. Paraphyses absent. Asci 8-spored, arising from a hyaline placenta-like tissue, radially extending into the locule around the Quellkörper from the base, unitunicate, clavate, pedicellate, apex rounded, without apical ring, evanescent. Ascospores bi-seriate to overlapping, hyaline, reniform, aseptate, smooth-walled, guttulate. Asexual morph: Undetermined (adapted from Engler 1895, Subramanian & Sekar 1990).
Notes – The monotypic Euacanthe was introduced based on Meliolopsis usambarensis (Theissen 1917). Nannfeldt & Santesson (1975) transferred this genus as Acanthonitschkea (Nitschkiaceae) and placed E. usambarensis as a synonym of A. foveolata. Subsequently, Subramanian & Sekar (1990) assigned Euacanthe in Coronophorales and accepted E. foveolata based on A. foveolata as the only species in this genus. Mugambi & Huhndorf (2010) sequenced E. foveolata and found it nested in Scortechiniaceae. We use the original name, E. usambarensis, as the current name of type species to avoid confusion in future work. In this study, Euacanthe is sister to Pseudocatenomycopsis (0.97BY) in Scortechiniaceae.
Type species: Euacanthe usambarensis (Rehm) Theiss., Annls mycol. 15(3/4): 272 (1917).
Other accepted species: Species Fungorum – search Euacanthe.
Figure 1 – Euacanthe usambarensis: a–b, f, h–j, m–n, q (S-F12537, holotype); c–e, g, k–l, o–p (S-F12538, isotype). a–d Ascomata sitting on a subiculum on host. e–f Ascoma cross section. g, j Conical Quellkörper. h Munk pores (arrow). i Peridium. k–n Asci. o Septate hyphae.
p–q Ascospores. Scale bars: a = 2 mm, b–c = 1 mm, d = 500 µm, e–f = 200 µm, g, i–j, o = 100 µm, h = 20 µm, k–n, p–q = 10 µm.
References
Engler A. 1895 – Die Pflanzenwelt Ost-Afrikas und der Nachbargebiete. Teil C, 1–433.
Subramanian CV, Sekar G. 1990 – Coronophorales from India-a monograph. Kavaka 18, 19–90.
Theissen F. 1917 – Über Tympanopsis und einige andere Gattungstypen. Annales Mycologici 15, 269–277.
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