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
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Lumbsch HT. 1999 – The ascoma development in Mycoporum elabens (Mycoporaceae, Dothideales). Plant biology 1, 321–326.
Park JS, Park SY, Park CH, Kondratyuk SY, Oh SO, Hur JS. 2017 – Taxonomic revision of the lichen genera Pertusaria, Varicellaria, and Variolaria (Pertusariales, Ascomycota) in South Korea. Mycobiology 45, 270–285.
Poelt J. 1969 – Bastimmungsschlüssel europäischer Flechten. Cramer, Lehre.
Thiyagaraja V, Lücking R, Ertz D, Wanasinghe DN et al. 2020 – Evolution of non-lichenized, saprotrophic species of Arthonia (Ascomycota, Arthoniales) and resurrection of Naevia, with notes on Mycoporum. Fungal Diversity 102, 205–224.
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