Mytilinidion aggregatum
Mytilinidion aggregatum (DC.) Duby [as 'Mytilidion'], Mém. Soc. Phys. Hist. nat. Genève 16(1): 34 (1861) [1862].
≡ Hysterium aggregatum DC., Fl. franç., Edn 3 (Paris) 5/6: 168 (1815).
Index Fungorum number: IF 236400; Facesoffungi number: FoF 11448, Fig. 1
Description:
Saprobic on host. Sexual morph: Ascomata 200–350 μm diam., 200–250 μm high, superficial, gregarious, in group or scattered, elongate or ellipsoid, conchate, small to medium sized, apex cristate, opening by longitudinal slit, surface black, smooth and shining or dull. Peridium 40–50 μm, thin-walled, carbonaceous, brittle, comprising few layers of sclerenchymatous cells. Hamathecium 1.3–2.1 μm, of narrow trabeculate pseudoparaphyses embedded in a gelatinous matrix. Asci 60−80 × 5−8 µm (x̄ = 67.5 × 5.9 µm, n = 10), 8-spored, bitunicate, fissitunicate, cylindrical to slender-clavate, with a short broad pedicel, ocular chamber indistinct, centrally orientated within the centrum, seldom borne laterally. Ascospores 13−14 × 4.9−5.2 µm (x̄ = 13.8 × 5.1 µm, n = 10), overlapping uniseriate, ellipsoid, fusoid, yellowish, light brown to reddish brown, 3-transversely septate, ends obtuse or acute, longer, faintly constricted at the median septum. Asexual morph: Unknown.
Material examined: Norway, on dead wood, Emil Rostrup (O-F 191194).
Fig. 1 Mytilinidion aggregatum (O-F 191194). a–c Herbarium material. d Appearance of ascomata on host surface. e, f Section through ascomata. g Peridium. h Trabeculate pseudoparaphyses. i–k Asci. l–o Ascospores. Scale bars: d = 500 μm, e = 100 μm, f, g = 30 μm, h = 5 μm, i–k = 20 μm, l–o = 10 μm.
Importance and distribution
There are 36 Mytilinidion epithets in Index Fungorum (2022), but several species have been transferred to Lophiotrema, Ostreichnion and Platystomum. Mytilinidion comprises 23 species known on Abies alba (Pinaceae), Cupressus macrocarpa (Cupressaceae), Erythrina brucei (Fabaceae), Juniperus communis (Cupressaceae), Larix occidentalis (Pinaceae), Pinus (Pinaceae), Poa sterilis (Poaceae), Populus tremula (Salicaceae), Pseudotsuga menziesii (Pinaceae), Sequoia gigantean (Pinaceae), Thuja plicata (Cupressaceae) and Vitex negundo (Lamiaceae). Mytilinidion has wide geographical distribution including Africa (Ethiopia), Asia (India, Russia), Europe (Georgia, Germany, Scotland, Sweden, United Kingdom) and The United States (California, Idaho, Louisiana, Massachusetts, Montana, Oregon).
References
Barr ME. 1975 – The genus Ostreichnion. Mycotaxon 3, 81–88.
Boehm EWA, Mugambi GKM, Miller AN, Huhndorf SM et al. 2009 – A molecular phylogenetic reappraisal of the Hysteriaceae, Mytilinidiaceae and Gloniaceae (Pleosporomycetidae, Dothideomycetes) with keys to world species. Studies in Mycology 64, 49–83.
Saccardo PA. 1883 – Sylloge Fungorum. 2, 1–815. Patavii, Italy.
Vasilyeva L. 2001 – Hysteriaceous fungi in the Russian Far East IV. Glyphium, Lophium and Mytilindion. Mikologiya i Fitopatologiya 35, 15–18.
Zogg H. 1962 – Die Hysteriaceae s. str. und Lophiaceae, unter besonderer Berücksichtigung der mitteleuropäischen Formen. Beiträge zur Kryptogamenflora der Schweiz Band 11, 1–190.
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