Yoshinagaia quercus
Yoshinagaia quercus Henn., Hedwigia 43(2): 143 (1904).
Index Fungorum number: IF 248365; Facesoffungi number: FoF 00136, Fig. 1
Description:
Saprobic on host. Sexual morph: Ascomata 1035–1040 μm diam., 375–400 μm high, superficial, epiphyllous, discoid, solitary or sometimes grouped, dark-brown, uni to multilocular, opening by irregular rupture, attached to the host by a relatively short foot-like basal stroma. Peridium 45–75 μm, comprising several layers of dark-brown, thick-walled pseudoparenchymatic cells forming a textura angularis. Hamathecium 2.5–3.7 μm, comprising cellular pseudoparaphyses. Asci 75–160 × 15–22 μm (x̄ = 142.2 × 19.9 µm, n = 10), cylindrical, short-stalked, 8-spored, fissitunicate with a distinct ocular chamber. Ascospores 13–16 × 8–11 μm (x̄ = 15.4 × 10.0 µm, n = 10), hyaline, aseptate, smooth, ovoid. Asexual morph: Conidiomata 1020–1030 μm diam., 320–400 μm high, pycnidial, superficial, epiphyllous, globose to discoid, separate, dark brown, unilocular. Conidiomatal wall 40–75 μm, comprising dark-brown, pseudoparenchymatous cells forming a textura angularis, opening by irregular rupture. Conidiophores 20–30 × 2–3 μm (x̄ = 25.5 × 2.6 µm, n = 10), hyaline, unbranched, septate, smooth, with acrogenous conidia formed from the base and sides of pycnidial and stroma walls when both the teleomorph and asexual morph are formed together inside it. Conidiogenous cells holoblastic, determinate, integrated, cylindrical, hyaline, smooth. Conidia 46–55 × 6–10 μm (x̄ = 47.5 × 7.2 µm, n = 10), 2-euseptate, median cell longer and guttulate, navicular, thin-walled, smooth, base truncate, apex extended into a single cellular irregularly branched appendage. The teleomorph and asexual morph occur together with asci and conidiophores lying side by side inside a stroma.
Material examined Japan, Seto Inland Sea, Shikoku, Waraku-en; Sakawa-machi, Tosa, on leaves of Quercus glauca (Fagaceae), 1 April 1925, T. Yoshinaga (BISH 608790, reference specimen designated here).
Fig. 1 Yoshinagaia quercus (BISH 608790, reference specimen designated here). a, b Herbarium material. c Appearance of ascomata on host surface. d Section through ascoma. e Peridium. f–i Asci (f, i: stained in congo red). j–m Ascospores (j–m: stained in congo red). n Conidiogenesis and conidiogenous cells. o–r Conidia. Scale bars: c = 1000 μm, d = 500 μm, e–i, n = 50 μm, j–m = 10 μm, o–r = 20 μm.
Importance and distribution
Yoshinagaia comprises only one species known on leaves of Quercus glauca (Fagaceae) in Asia (Japan) and leaves of Cyclobalanopsis morii (Fagaceae) in Asia (Taiwan).
References
Eriksson O, Hawksworth DL. 1986 – Notes on ascomycete systematics Nos 1-224. Systema Ascomycetum 5, 113–174.
Eriksson OE, Hawksworth DL. 1993 – Notes on ascomycete systematics-Nos 1418-1529. Systema Ascomycetum 11,163–194.
Farr ER, Leussink JA, Stafleu FA. 1979 – Index Nominum Genericomm 1-111. Regnum Vegetale 100, 1430.
Hara K. 1912– On Coccoideaceae. Botanical Magazine Tokyo 26, 139–144.
Hara K. 1927 – The Diseases of Trees. Yokendo Ltd: Tokyo, Japan. (171)–(172).
Hennings P. 1904 – Einige neue Pilze aus Costa Rica and Paraguay. Hedwigia 43, 147–149.
Hohnel F. 1909 – Fragmente zur Mykologie. Sitzungsberichte der Akademie der Wissenschaften in Wien. Abt. 1, 118, 813–904.
Lumbsch HT, Huhndorf SM. 2010 – Outline of Ascomycota–2009. Fieldiana Life and Earth Sciences 1, 1–60.
Sivanesan A, Hsieh W. 1995 – A re-appraisal of the systematic status of the ascomycete genus Yoshinagaia. Mycological Research 99, 1295–1298.
Thambugala KM, Ariyawansa HA, Li YM, Boonmee S et al. 2014a – Dothideales. Fungal Diversity 68, 105–158.
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