Chaetoconis vaccinii
Chaetoconis vaccinii Melnik & Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 191 (1993)
Saprobic on Vaccinium uliginosum (Ericaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 200–250 µm diam., 100–200 µm high, black, pycnidial, solitary to gregarious, initially immersed, then become sunken and erumpent, broadly conical to depressed globose in sectional view, unilocular, thick-walled, glabrous, ostiolate. Ostiole 80–100 × 30–60 µm, single, long, cylindrical to subcylindrical, eccentric. Conidiomatal wall 10–40 µm wide, composed of a basal textura angularis with thick-walled, pale brown cells, gradually merging with hyaline cells, and a peripheral textura prismatica with thick-walled, dark brown to black cells. Conidiophores formed from the innermost cells of conidiomata, hyaline, septate, branched, smooth-walled, invested in mucus. Conidiogenous cells 10–20 × 2–4 µm, enteroblastic, hyaline, subcylindrical to cylindrical or irregular, discrete or mostly integrated, with minute periclinal thickenings in the collarette zone, with 1–3 percurrent proliferations. Conidia 35–76 × 6–9 µm (x= 53 × 7 µm; n = 30), hyaline, obclavate, ellipsoidal or irregular, with narrow and obtuse base, 1–4-septate, mostly 3-septate, thick-walled, guttulate, apical cell attenuated into a tubular, flexuous, unbranched or occasionally forked appendage 20–49 × 2–3 µm (x= 35.5 × 2 µm).
Material examined: Russia, Kamchatka Region, Kronokense Reservation, on Vaccinium uliginosum (Ericaceae), 1 August 1981, N. Vassiljeva (DAOM 215176, holotype).
Chaetoconis vaccinii (DAOM 215176, holotype) a, b Herbarium package and specimen. c, d Appearance of black conidiomata on the host. e, f Vertical sections of conidiomata. g, i Section of peridium. h Surface view of conidiomatal wall. j–l Conidiogenous cells and developing conidia. m–r Conidia. Scale bars c = 500 µm, d = 200 µm, e–f = 100 µm, g, h = 50 µm, i = 20 µm, j–l = 5 µm, m–r = 10 µm.
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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