Exidia zelleri Lloyd
Abstract
Exidia zelleri Lloyd, Mycological Writings 6: 931, 1920 Figs 23 J, 24 F = Exidia glandulosa f. lobata Neuhoff, Arkiv för Botanik 28 A (1): 13. = Exidia glandulosa f. nannfeldtii Neuhoff, Arkiv för Botanik 28 A (1): 14. Holotype. USA. Oregon: Benton Co., Corvallis, [Acer sp.], 11 Oct 1919, Zeller 1775 (NY 00738335 – isotype, studied) (Figs 23 J, 24 F). Description. Basidiomata annual, at first adpressed-orbicular, narrowly attached, then turbinate or nearly cupulate, up to 1 cm in diam., up to 0.5 cm thick, sometimes partly fusing together and forming compound effused basidiomata, up to 3 cm in the longest dimension, gelatinous. Hymenial surface uneven or indistinctly folded, rarely minutely warted, brownish-black, in dry condition completely black. Abhymenial surface smooth, grayish-brown to brownish-black. Margin free, concolourous with hymenial surface, entire, even or lobate. Hyphal structure monomitic, hyphae clamped; context hyphae hyaline or brownish, predominantly thin-walled, interwoven, anastomosing, 1–5 μm in diam., subhymenial hyphae hyaline to brownish, thin-walled or with a distinct wall, ascending or interwoven, 1–4 μm in diam., basidia-bearing hyphae 2–6 μm in diam. Hyphidia with a hyaline or brownish hyphoid stem, 2–11 μm in diam., and hyaline or brownish apical branches, 0.5–2 μm in diam., forming a continuous layer up to 100 μm thick. Probasidia broadly clavate to tapering or subfusiform, 15–29 × 6–11.5 μm. Basidia four-celled, ellipsoid-ovoid to narrowly ovoid, thin-walled, (14 –) 14.5–26 (– 28.5) × (8.9 –) 9.0–15.1 (– 15.3) μm (n = 71 / 5), sterigmata up to 50 × 1.5–2.5 μm. Basidiospores narrowly cylindrical or cylindrical to allantoid, slightly to distinctly curved, (13.0 –) 13.2–21.9 (– 22.2) × (4.1 –) 4.2–7.0 (– 7.2) μm (n = 140 / 5), L = 16.49–18.68, W = 4.81–6.08, Q = 2.92–3.55. Remarks. Exidia zelleri is a member of the E. glandulosa complex (Figs 1, 2, 8). Macroscopically, it is very different from the two other species of this group, E. glandulosa and E. truncata, due to its rather small basidiomata with smooth hymenial and abhymenial surfaces (Fig. 24). However, its large basidia and basidiospores are strongly reminiscent of those of the two aforementioned species. Exidia zelleri is widely distributed in the northern hemisphere but rarely collected, most likely due to its quite insignificant fructifications. It occurs predominantly on dead wood of Salicaceae and rarely also on other host trees (Acer and Alnus). Specimens of E. zelleri are often sterile. They can be nonetheless identified as belonging to this species due to the nearly smooth hymenial surface without spine-like projections, as well as the large basidia. Exidia zelleri was described by Lloyd (1920) from Oregon, USA. The host species was identified by the original collector as Sambucus. However, the later re-examination by H. C. Klett (herbarium note in NY from August 26 th, 1963) showed that the host tree was actually Acer sp. The isotype of E. zelleri in NY is still in a good condition, with rather numerous, turgid, allantoid or narrowly cylindrical spores, ca. 14–18 × 4–5.5 μm. These spore dimensions, in combination with the lack of hymenial projections, definitely preclude any other nigrescent Exidia species dealt with in this paper. Neuhoff (1936 b) introduced two forms of E. glandulosa sensu auct. from northern Sweden, f. lobata and f. nannfeldtii. Based on his descriptions, they are both considered here as belonging to E. zelleri. Torkelsen (1972) reported f. lobata from Norway. The basidial and basidiospore measurements given by her certainly point to E. zelleri.
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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Affiliation as printed
Organismic Botany and Mycology, Institute of Plant Science and Microbiology, Ohnhorststraße 18, 22609 Hamburg, Germany
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Affiliation as printed
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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