Cercidospora ulothii
Cercidospora ulothii Körb., Parerga lichenol. (Breslau) 5: 466 (1865).
Index Fungorum number: IF 212854; Facesoffungi number: FoF 12160, Fig. 1
Description:
Saprobic on Squamaria saxicola. Sexual morph: Perithecia 145–300 mm diam., stromatic, inconspicuous, sparse to gregarious, immersed on the substrate, with a thick, black, multilayered wall in the upper half. Paraphysoids 1.5–2 µm scarcely abundant. Asci 65–90 × 9–11 μm (x̄ = 72.3 × 10.9 µm, n = 10), cylindrical, bitunicate, rounded at the tip, stalked at the base, 4–8 spored, 2-seriate above, uniseriate below. Ascospores 19–30 × 4–7 μm (x̄ = 20.3 × 5.9 µm, n = 10), fusoid, naviculate, with both cells equal in shape and size, median 1-euseptate, bi-celled, hyaline, smooth, conical at both ends. Asexual morph: Unknown.
Material examined: Europe, Germany, on thallus of ascolichen (Apothecial) on Squamaria saxicola (Parmeliaceae), Uloth WLH (L 0056597, holotype).
Fig. 1 Cercidospora macrospora (L 0056597, holotype). a Details of herbarium material. b, c Ascomata on host substrate. d Vertical section through ascomata. e Peridium. f, g Asci. h Paraphyses. i, j Hyaline 1-euseptate ascospores (j: stained in cotton blue). Scale bars: d = 50 μm, e–j = 10 μm.
Importance and distribution
There are 102 Cercidospora epithets in Index Fungorum (2022), but several species have been transferred to other genera such as Apiosporella, Arthopyrenia, Astrosphaeriella, Blastodesmia, Cercidospora, Collemopsidium, Didymella, Didymellopsis, Discostroma, Glomerella, Gnomoniopsis, Isothea, Keissleriella, Leptosphaeria, Lophiostoma, Mycosphaerella, Nectria, Prolisea, Pseudomassaria, Scirrhia, Seimatosporium, Stagonosporopsis, Teratosphaeria, Xenodidymella and Zwackhiomyces. Cercidospora comprises 33 species known on a wide range of hosts such as Arthrorhaphis alpina (Arthrorhaphidaceae), on bark of Fagus sylvatica (Fagaceae), on thallus of Stereocaulon cumulatum (Stereocaulaceae), Rhizocarpon geographicum (Rhizocarpaceae), Rhizoplaca peltata (Lecanoraceae), thalli of Thamnolia vermicularis var. subuliformis (Icmadophilaceae), thallus of Aspicilia caesiocinerea (Megasporaceae), thallus of Pertusaria pertusa (Pertusariaceae), upper part of podetia of Cladonia arbuscula (Cladoniaceae) and on volcanic rock. Cercidospora is reported mainly from Northern Hemisphere (example, Asia, Europe, North Africa and North America) but is also known from South America (Navarro-Rosinés et al. 2004). Species of Cercidospora are lichenicolous, commensalistic or non-lichenized.
References
Grube M, Hafellner J. 1990 – Studien an flechtenbewohnenden Pilzen der Sammelgattumg Didymella (Ascomycetes, Dothideales). Nova Hedwigia 51 (3–4), 283–360.
Hafellner J. 1987 – Studien über lichenicole Pilze und Flechten VI. Ein verändertes Gattungskonzept für Cercidospora. Herzogia 7, 355–365.
Navarro-Rosinés P, Calatayud V, Hafellner J. 2004 – Cercidospora. In: Nash TH. III, Ryan BD, Diederich P, Gries C, Bungartz F. (eds.): Lichen Flora of the Greater Sonoran Desert Region, Volume 2. Lichens Unlimited, Arizona State University, Tempe, Arizona, pp. 635–639.
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