Exidia recisa Fr.
Abstract
Exidia recisa (Ditm.) Fr., Systema Mycologicum 2: 223, 1822 Figs 20 G, 23 A, 23 B ≡ Tremella recisa Ditm. in Sturm, Deutschlands Flora, Abt. 3, 1 (1): 27, 1817. Lectotype (iconotype) (selected here, MBT 10031437). Table 13 (Tremella recisa) in Sturm, Deutschlands Flora, Abtheilung 3, 1 (1), 1817. Epitype (selected here, MBT 10031438). Finland. Etelä-Häme: Muurame, Niittyaho, Salix fragilis, 18 Mar 2017, Laaka-Lindberg 1-180317 * (H). = Exidia brunneola P. Karst., Bidrag till Kännedom av Finlands Natur och Folk 48: 450, 1889. Holotype. Finland. Etelä-Häme: Tammela, Mustiala, Populus nigra, 2 Mar 1870, Karsten 2138 (H 6049699, studied). Description. Basidiomata annual, cupulate-orbicular, up to 3 cm in diam., rarely up to 5 cm in diam., narrowly attached, later partly fusing together but remaining separable, up to 1 cm thick, gelatinous. Hymenial surface even or variably folded, rarely bearing scattered granular projections up to 0.1 mm long, at first ochraceous- to reddish-brown, later dark brown, in dry condition darkening to nearly black. Abhymenial surface rough, covered by tightly arranged dots, reddish-brown or dark brown. Margin free, concolourous with hymenial surface, entire, even or indistinctly lobate, in older basidiomata sometimes indistinctly incised. Hyphal structure monomitic, hyphae clamped; context hyphae hyaline or yellowish-brownish, occasionally encrusted, thin- to slightly thick-walled, interwoven or subparallel, anastomosing, 1–6.5 μm in diam., subhymenial hyphae hyaline or yellowish-brownish, occasionally encrusted, thin- to slightly thick-walled, predominantly interwoven, 1–4 μm in diam., basidia-bearing hyphae with a distinct wall, 1.5–4 μm in diam. Hyphidia with a hyaline or brownish, often encrusted, hyphoid or nodulose stem, 2–12 μm in diam., and hyaline apical branches, 0.5–1.2 μm in diam., covered by yellowish-brown gelatinous matrix and forming a continuous layer up to 80 μm thick. Probasidia distinctly tapering or more rarely clavate, 10.5–25 × 5–9 μm. Basidia four-celled, ellipsoid-ovoid, often somewhat tapering to the base, sometimes obliquely septate, (12 –) 12.5–18 (– 19) × (6.2 –) 6.3–10.8 (– 11.5) μm (n = 60 / 6), sterigmata up to 35 × 1.5–2.5 μm. Basidiospores narrowly cylindrical to allantoid, distinctly curved, (9.2 –) 11.0–17.9 (– 19.2) × (2.8 –) 2.9–4.2 (– 4.3) μm (n = 240 / 8), L = 13.14–15.82, W = 3.15–3.83, Q = 3.15–4.48. Remarks. Exidia recisa is a common species in Europe. It mostly inhabits branches and thin stems of Salix spp. in various habitats but rarely occurs on hanging or just fallen twigs of other angiosperms (Padus, Populus, Tilia, and Ulmus). The occurrence on Salix and on average longer basidiospores help to differentiate it from other European representatives of the E. recisa complex, i. e. E. impressa, E. straminea and E. umbrinella. However, specimens of E. recisa from the other host trees, especially those with shorter basidiospores, can be easily mistaken for E. impressa and E. straminea. In these cases, additional morphological characters (basidiome color, the presence of hymenial projections, as well as the shape of hyphidia) should be used for species identification. The eastern distribution limits of E. recisa are unknown. According to our data, the easternmost record of this species is in Khakassia, Central Siberia. The species was first introduced by Ditmar (in Sturm 1817) as Tremella recisa and then moved to Exidia by Fries (1822). No authentic material of T. recisa is known to us. We therefore select the original illustration by Ditmar as the lectotype of this species and supplement it with a newly selected and sequenced epitype. Exidia brunneola was described from Finland based on a single collection from a poplar tree (Karsten 1889) which is not native to the country. However, its morphological traits do not separate it from other E. recisa specimens studied by us. We therefore relegate E. brunneola to the synonyms of E. recisa.
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
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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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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
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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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