Exidia straminea Berk.
Abstract
Exidia straminea Berk., Hooker’s Journal of Botany 3: 19, 1851 Figs 23 F, 24 B Lectotype (iconotype) (selected here, MBT 10031440). Table I, fig. 4 in Hooker’s Journal of Botany 3, 1851. Epitype (selected here, MBT 10031441). France. Aveyron: Millau, Le Monna, Amelanchier ovalis (dead hanging branch), 23 Feb 2025, Spirin 18148 * (H). Description. Basidiomata annual, cupulate-orbicular, up to 3 cm in diam., narrowly attached, later partly fusing together but remaining separable, up to 1 cm thick, gelatinous, older basidiomata sometimes nearly cerebriform. Hymenial surface even or variably folded, sometimes bearing scattered granular projections up to 0.1 mm long, at first amber-yellow or ochraceous-brownish, later bright reddish-brown, in dry condition darkening to dark brown or brownish-black. Abhymenial surface rough, covered by tightly arranged dots, yellowish-ochraceous to reddish-brown. Margin free, concolourous with hymenial surface, entire, even or indistinctly lobate. Hyphal structure monomitic, hyphae clamped; context hyphae hyaline, occasionally bearing scattered colorless encrustation, thin- to slightly thick-walled, interwoven, anastomosing, 1–6 μm in diam., subhymenial hyphae hyaline or brownish, occasionally sparsely encrusted, thin-walled or with a distinct wall, ascending or interwoven, 1.5–4 μm in diam., sometimes producing large bubble-like segments up to 15 μm in diam., basidia-bearing hyphae thin-walled or with a distinct wall, 2–5 μm in diam. Hyphidia with a hyaline or brownish, occasionally encrusted hyphoid stem, 1.5–8 μm in diam., and hyaline apical branches, 1–1.5 μm in diam., embedded in brownish gelatinous matrix and forming a continuous layer up to 40 μm thick. Probasidia distinctly tapering or clavate, 9–24 × 4–7 μm. Basidia four-celled, ellipsoid-ovoid, more rarely broadly clavate, sometimes obliquely septate, (10.5 –) 11–18 (– 18.5) × (5.8 –) 6.2–11.0 (– 11.1) μm (n = 80 / 8), sterigmata up to 40 × 1–1.5 μm. Basidiospores narrowly cylindrical to allantoid, distinctly curved, occasionally two-or three-celled, (9.2 –) 9.3–15.7 (– 15.8) × (2.8 –) 2.9–4.1 (– 4.3) μm (n = 260 / 9), L = 11.32–13.86, W = 3.18–3.72, Q = 3.35–4.13. Remarks. Exidia straminea is a look-alike of E. recisa distributed in the southern part of Europe. It inhabits dead branches and thin stems of various shrubs but seemingly never occurs on Salix spp. Morphologically, it can be separated from E. recisa in having amber-yellow or light-brown basidiomata without any tints of red, as well as by its shorter basidiospores. Another similar species occurring in the same geographic area on deciduous hosts is E. impressa. It has much darker basidiomata than E. straminea and occasionally possesses distinctive sharp projections on the hymenial surface. Microscopically, it can be separated from E. straminea in having two types of hyphidia. The basidiospores of both species are nearly identical. Exidia straminea was described from southern France (Berkeley 1851). We could not trace the type specimen of this species. The only extant authentic material of E. straminea is a microscopic drawing published by Berkeley. We therefore select it as a lectotype (iconotype) of E. straminea. Unfortunately, it provides no worthwhile information for species recognition. The “ 2–3 - septate moniliform threads ” depicted by Berkeley may equally be bubble-like segments of subhymenial hyphae or immature basidia. Fortunately, the macroscopic part of the protologue is rather clear and it evidently refers to a pale-colored specimen of E. straminea as it is reintroduced above. We designate an epitype to maintain our understanding of this species. The description of E. impressa by Bourdot and Galzin (1927) mostly refers to E. straminea. This species was misidentified by Wu et al. (2020) as E. repanda.
Authors 13
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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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Komarov Botanical Institute of the Russian Academy of Sciences
Affiliation as printed
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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Affiliation as printed
Société Linnéenne de Lyon, 33 rue Bossuet, 69006 Lyon, France
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Affiliation as printed
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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Affiliation as printed
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
Affiliation as printed
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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