Quaternaria quaternata
Quaternaria quaternata (Pers.) J. Schröt., in Cohn, Krypt.-Fl. Schlesien 3.2(4): 451 (1897) [1908]
= Quaternaria persoonii Tul. & C. Tul., Select. fung. carpol. 2: 105 (1863)
= Libertella faginea Desm., Annls Sci. Nat., sér. 1 19: 276 (1830)
Facesoffungi number: FoF 07558
Saprobic on dead stems of Fagus sylvatica (Fagaceae). Sexual morph: see Mehrabi et al. (2016). Asexual morph: Conidiomata 800–2000 µm diam., 400–600 µm high, brown, acervular, subepidermal, separate or gregarious, immersed, subglobose or irregular in shape, unilocular, glabrous, thick-walled. Conidiomatal wall 30–50 µm wide, composed of pale brown to hyaline, thick-walled cells of texura angularis to texura intricata at the basal stroma. Conidiophores hyaline, subcylindrical, fasciculate, branched, septate in association with branches, tapered towards the apices, formed from the inner cells of basal stroma. Conidiogenous cells 14–26 × 1–2 µm, hyaline, holoblastic, sympodial, cylindrical, integrated, indeterminate, thick- and smooth-walled. Conidia 15–22 × 1–2 µm (
= 19 × 1.5 µm; n = 30), hyaline, falcate, rounded at each end, curved, aseptate, thin-walled, smooth, eguttulate.
Material examined: Italy, Province of Forlì-Cesena, Passo la Calla, on dead land branches of Fagus sylvatica (Fagaceae), 3 August 2015, Erio Camporesi, IT2577 (MFLU 15-2605), (KUN, HKAS 93599).
Notes: The asexual morph of Quaternaria quaternata resembles Tryblidiopsis pinastri (= Tryblidiopycnis pinastri Höhn.) in having holoblastic, sympodial conidiogenous cells and falcate conidia, but it is distinguished by conidiomatal structure. Quaternaria quaternata has acervular, unilocular conidiomata, whereas T. pinastri has pycnidial, unilocular to multilocular conidiomata with thick basal stroma.
Quaternaria quaternata (MFLU 15-2605) a Herbarium package and specimens. b, c Appearance of brown conidiomata on the host. d Vertical section of conidiomata. e Section of peridium. f–k Conidiophores, conidiogenous cells and developing conidia (arrows show conidiogenous loci). l–q Conidia. Scale bars: d = 1000 μm, e = 200 μm, f, l = 20 μm, g–k = 10 μm, m–q = 5 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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