Mycoporum elabens
Mycoporum populnellum Nyl., Flora, Regensburg 56(19): 298 (1873).
Index Fungorum number: IF 395779; Facesoffungi number: FoF 11615, Fig. 1
Description:
Saprobic on growing bark of trees or stems. Sexual morph: Ascomata semi-immersed to superficial on host surface, simple, visible as dark brown to black circle on host surface. Peridium thick-walled, composed of several layers of dark-brown cells of textura angularis. Hamathecium present, with cellular pseudoparaphyses, anastomosing, branching, embedded in mucilaginous matrix, sometimes aparaphysate, covering asci by gelatinous matrix. Asci bitunicate, fissitunicate, 8-spored, ovoid to saccate, sessile with indistinct ocular chamber, thick-walled. Ascospores bi-to tri-seriated, or overlapping, oblong to cylindrical or ellipsoid, hyaline to subhyalineuniseptate, very slightly constricted at the septum, smooth or rough-walled. Asexual morph: Unknown.
Material examined: Finland, Etelä-Häme, Tavastia, Asikkala, on dead stem, June 1892, J.P Norrlin (1866) (F216647, holotype).
Fig. 1 Mycoporum populnellum (F216647, holotype). a Details of herbarium material. b, c Habit and appearance of ascomata on host surface. d Section of ascoma. e Peridium. f Hamathecium. g–i Asci. j–n Ascospores. Scale bars: b = 2000 µm, c = 1000 µm, d = 50 µm, e, g, h = 10 µm, f, j–n = 5 µm, i = 20 µm.
Importance and distribution
There are 60 Mycoporum epithets in Index Fungorum (2022), but many species have been transferred to other genera namely Arthopyrenia, Arthothelium, Constrictolumina, Cyrtidula, Dermatina, Didymocyrtis, Endococcus, Mellitiosporium, Muellerella, Mycoporellum, Mycoporopsis, Phaeocyrtidula, Polycoccum, Porothelium, Pyrenula, Rhaphidicyrtis, Sphaerellothecium, Stigmidium, Tichothecium and Zwackhiomyces. Mycoporum comprises 12 species known on Berberis vulgaris (Berberidaceae), Corylus avellana (Betulaceae), Ilex sp. (Aquifoliaceae), Quercus (Fagaceae) and Populus tremula (Salicaceae). Mycoporum is distributed in Asia (India (Maharashtra)), Europe (Sweden, United Kingdom) and The United States (Florida).
References
Aptroot A, Lücking R, Sipman HJM, Umaña L, Chaves JL. 2008 – Pyrenocarpous lichens with bitunicate asci: a first assessment of the lichen biodiversity inventory in Costa Rica. Bibliotheca Lichenologica 97, 1–162.
Eriksson OE. 1981–The families of bitunicate ascomycetes. Nordic Journal of Botany 1, 800.
Harris RC. 1973 – The corticoloios pyrenolichens of the Great Lakes region. Mich Bot 12, 3–68.
Harris RC. 1995 – More Florida lichens. Including the 10c tour of the pyrenolichens. The New York Botanical Garden.
Lendemer JC, Harris RC, Tripp EA. 2013 – The lichens and allied fungi of Great Smoky Mountains National Park: an annotated checklist with comprehensive keys. Memoirs of the New York Botanical Garden 104, 1–152.
Poelt J. 1969 – Bastimmungsschlüssel europäischer Flechten. Cramer, Lehre.
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