Exidiopsis effusa Vuillemin
Abstract
Exidiopsis effusa (Bref.) Vuillemin, Bulletin des Séances de la Société des Sciences de Nancy 2 (3): 30, 1890 Figs 25 A, 26, 27 A, 27 B ≡ Exidia effusa Bref., Untersuchungen aus dem Gesammtgebiete der Mykologie 7: 94, 1888. Lectotype (selected here, MBT 10031445). Fig. 20, Tafel V in Brefeld, Untersuchungen aus dem Gesammtgebiete der Mykologie 7, 1888. Epitype (selected here, MBT 10031446). Sweden. Västergötland: Göteborg, Guldheden, Salix caprea (fallen log), 14 Mar 2025, Spirin 18205 * (GB). = Exidiopsis quercina Vuillemin, Bulletin des Séances de la Société des Sciences de Nancy 2 (3): 30, 1890. Neotype (selected here, MBT 10031447). France. Lozère: Saint-Etienne-du-Valdonnez, Forêt du Sapet, Fagus sylvatica (fallen branch), 28 Jun 2022, Spirin 15511 * (H). Description. Basidiomata annual, effused, usually up to 10 cm in the longest dimension but occasionally exceeding 1 m long (while growing on dead standing logs), at first waxy-gelatinous and watery-grayish, semitranslucent, then more or less distinctly gelatinized, drying to a hardly visible, vernicose crust, up to 0.1 mm thick. Hymenial surface smooth or more often bearing randomly or rather regularly arranged spine-like projections up to 150 × 100 μm, 2–3 per mm, and at least partly covered by a grayish or pale lilac, easily removable pruina. Margin rather sharply delimited, adnate, concolorous with hymenial surface. Hyphal structure monomitic, hyphae clamped; subicular hyphae thin- or slightly thick-walled, gelatinized, mostly interwoven, 2–4 μm in diam., occasionally inflated up to 7–8 μm in diam., subhymenial hyphae thin-walled, predominantly ascending, often agglutinated, 1.5–4.5 μm in diam., occasionally inflated up to 5–6 μm in diam.; basidia-bearing hyphae thin-walled, 1.5–4 μm in diam., sometimes showing a zigzag-like branching pattern. Hyphidia thin-walled, with a hyaline, hyphoid or subfusiform stem, 20–40 × 2–6 μm in diam., and dendroid apical branches 1–1.5 μm in diam., forming a loose continuous layer up to 15 μm thick. Probasidia broadly clavate, 10–30 (– 40) × 5–9 μm. Basidia narrowly ellipsoid-ovoid, four-celled, (10.5 –) 12–21.5 (– 23) × (8.0 –) 8.1–12.3 (– 13.2) μm (n = 80 / 7), thin-walled, embedded, often with a distinctly tapering stalk-like base, up to 7 × 4 μm, sterigmata up to 25 × 2–3 μm. Basidiospores thin-walled, narrowly cylindrical to cylindrical, often distinctly curved, (9.4 –) 9.8–16.8 (– 17.2) × (3.6 –) 3.7–6.2 (– 6.6) μm (n = 210 / 7), L = 11.40–14.26, W = 4.14–5.26, Q = 2.46–2.91. Remarks. As mentioned above, this species was first described from Germany by Brefeld (1888) as Exidia effusa and later moved to Exidiopsis by Vuillemin (1890). No authentic specimens by Brefeld are extant. We therefore select his illustration accompanying the protologue as a lectotype of this species. Brefeld’s description and drawings are very clear, and the identity of his species is certain. One of the most important macroscopic traits mentioned in the protologue is the presence of papillate outgrowths on the hymenial surface. We were able to observe them in all freshly collected specimens of E. effusa (Fig. 25 A). These projections, as well as (at least partly) gelatinized, semitranslucent basidiomata of E. effusa are the easiest traits to separate it from the closely related E. perflua (see further remarks under that species). According to our data, E. effusa has a western distribution in Europe. We studied specimens of E. effusa from France, Luxembourg and the southern part of Scandinavia. GenBank sequence PV 330055 also indicates its presence in Belgium. In turn, E. perflua seems to be restricted to more northern and eastern areas of Europe. Based on this distribution pattern, we treat E. quercina, originally collected in the north-eastern part of France, as a synonym of E. effusa. Maire (1902) stated that he had an opportunity to study authentic material of E. quercina stored in alcohol. The current location of this material is unknown. We therefore select a neotype for E. quercina.
Authors 13
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University of Helsinki · Finnish Museum of Natural History
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Finnish Museum of Natural History, University of Helsinki, PO Box 7, 00014 Helsinki, Finland
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Komarov Botanical Institute of the Russian Academy of Sciences
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Komarov Botanical Institute, Prof. Popova str. 2, 197022 St. Petersburg, Russia
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Organismic Botany and Mycology, Institute of Plant Science and Microbiology, Ohnhorststraße 18, 22609 Hamburg, Germany
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Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, Netherlands
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Société Linnéenne de Lyon, 33 rue Bossuet, 69006 Lyon, France
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Österplana Skattegården 2, 53384 Hällekis, Sweden
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Affiliation as printed
Globe Institute, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, Denmark
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Affiliation as printed
Institute of Biological Sciences, University of Oslo, P. O. Box 1045, Blindern, N- 0316 Oslo, Norway
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University of Tennessee at Knoxville
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Department of Ecology and Evolutionary Biology, University of Tennessee, 1406 Circle Drive, Knoxville, Tennessee 37996, USA
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Ecology and Genetics Research Unit, University of Oulu, P. O. Box 3000, FI- 90014 Oulu, Finland
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Czech Academy of Sciences, Biology Centre
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Biology Centre, Academy of Sciences of the Czech Republic, Branišovská 31, CZ 37005, České Budějovice, Czech Republic
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National University of Misiones
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Instituto de Biotecnología Misiones (InBioMis), Facultad de Ciencias Exactas, Químicas y Naturales, Universidad Nacional de Misiones, Ruta Nacional N 12, km 7.5, Posadas, Misiones, CP 3304, Argentina & Instituto Misionero de Biodiversidad (IMiBio), Ruta Nacional N 12, km 5, Puerto Iguazú, Misiones, CP 3370, Argentina
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University of Helsinki · Finnish Museum of Natural History
Affiliation as printed
Finnish Museum of Natural History, University of Helsinki, PO Box 7, 00014 Helsinki, Finland
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