Leptomelanconium asperulum
Leptomelanconium asperulum (Moesz) Petr., in Sydow, Annls mycol. 21(3/4): 179 (1923).
≡ Melanconium asperulum Moesz, Bot. Közl. 14(5-6): 157 (1915).
Index Fungorum number: IF 212573; Facesoffungi number: FoF 11387, Fig. xx
Description:
Saprobic on needles of Pinaceae. Sexual morph: Unknown. Asexual morph: Conidiomata 395–400 μm diam., 379–400 μm high, acervular, subepidermal or immersed, erumpent at maturity, solitary or gregarious, sometimes confluent, globose, unilocular. Conidiomata wall 35–55 μm, comprising thin-walled, pale brown cells of textura angularis. Conidiophores 15−30 × 2.1−4.4 µm (x̄ = 16.3 × 4.0 µm, n = 20), reduced to conidiogenous cells, sometimes cylindrical to filiform, unbranched or branched at the base, septate, hyaline to pale brown, smooth walled, formed from the upper pseudoparenchyma. Conidiogenous cells 21−25 × 4.1−5.6 µm (x̄ = 23.5 × 4.7 µm, n = 20), holoblastic, annellidic, cylindrical, discrete or integrated, indeterminate, pale brown, verruculose. Conidia 9.5−11 × 3.4−5.0 µm (x̄ = 10.4 × 4.1 µm, n = 20), cylindrical or ellipsoid, navicular to clavate, with a truncate base, 0–1-septate, continuous brown, thick-walled, verruculose.
Material examined: Germany, Kamm des Riesengebirges near Prinz-Heinrich-Baude 47.783333 10.016667, on Pinus mughus (Pinaceae), August 1922, H. Sydow (Syd. Myc.germ.2000).
Fig. 1 Leptomelanconium asperulum (Syd. Myc.germ.2000). a, b Herbarium
label and specimen. c, d Appearance of conidioma on host substrate. e Section through conidioma. f, g Conidiophores and Conidiogenesis. h–o Conidia. Scale bars: c = 2000 μm, d = 500 μm, e = 100 μm, f, g = 10 μm, h–o = 5 μm.
Importance and distribution
There are eleven Leptomelanconium epithets in Index Fungorum (2022), but seven species are recognized distributed on five host plants Abies balsamea (Pinaceae), Eucalyptus ficifolia (Myrtaceae), Picea mariana (Pinaceae), Pinus montana (Pinaceae) and Populus tremuloides (Salicaceae). Leptomelanconium has wide distribution including Asia (China), Europe (Austria, Germany, Hungary, Poland), North America (Canada, Mexico), Oceania (Australia, New Zealand) and The United States (California).
References
Crous PW, Summerell BA, Carnegie AJ, Wingfield MJ. 2009 – Unravelling Mycosphaerella: do you believe in genera? Persoonia 23, 99–118.
Petrak F. 1962 – rgebnisse einer Revision der Grundtypen verschiedener Gattungen der Askomyzeten und Fungi Imperfecti. Sydowia 16, 353–361.
Sutton BC. 1977 – Coelomycetes VI. Nomenclature of generic names proposed for Coelomycetes. Mycological Papers 141, 1–253.
Sutton BC. 1980 – The Coelomycetes. Fungi imperfecti with pycnidia, acervuli and stromata. Commonwealth Mycological Institute, Kew, pp 1–696.
Wijayawardene NN, Hyde KD, Wanasinghe DN, Papizadeh M et al. 2016 – Taxonomy and phylogeny of dematiaceous coelomycetes. Fungal Diversity 77, 1–316.
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