Exidia umbrinella Bres.

Abstract

Exidia umbrinella Bres., Fungi Tridentini 2 (14): 98, 1900 Figs 23 I, 24 D Lectotype (selected here, MBT 10031444). Italy • Trentino-Alto Adge: Trento, Pellizzano, Val di Sole, Abies alba, 1888 Bresadola (S F 20648, studied). Description. Basidiomata annual, button-like to cupulate-orbicular, up to 2 cm in diam., narrowly attached, up to 0.5 cm thick, gelatinous. Hymenial surface even or 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. Hyphal structure monomitic, hyphae clamped; context hyphae hyaline or yellowish, thin-walled or with variably thickened, gelatinized walls, interwoven or subparallel, anastomosing, 1–5 μm in diam., subhymenial hyphae hyaline or yellowish-brownish, thin-walled or with a distinct wall, predominantly ascending, 1–3 μm in diam., basidia-bearing hyphae thin-walled or with a distinct wall, 2–4 μm in diam. Hyphidia with a hyaline or brownish, often sinuous hyphoid stem, 3–5 μm in diam., and hyaline or brownish apical branches, 1–2 μm in diam., embedded in yellowish-brownish gelatinous matrix and forming a continuous layer up to 20 μm thick. Probasidia tapering or clavate, 9–13.5 × 4.5–5.5 μm. Basidia four-celled, narrowly ellipsoid-ovoid, (9.5 –) 10–13.5 (– 14) × (6.2 –) 6.7–9.8 (– 10.8) μm (n = 42 / 2), sterigmata up to 30 × 1–2 μm. Basidiospores narrowly cylindrical to allantoid, distinctly curved, (8.7 –) 9.0–13.2 (– 13.8) × (2.7 –) 2.8–3.8 (– 4.0) μm (n = 52 / 2), L = 11.29–12.00, W = 3.10–3.33, Q = 3.41–3.90. Remarks. Exidia umbrinella is a member of the E. recisa complex (Fig. 9). It is the only species in this group known so far to occur on coniferous hosts. The substrate, as well as rather short basidiospores, provide sufficient grounds to separate E. umbrinella from the otherwise very similar E. recisa. This species was described by Bresadola (1900) based on a rather large set of specimens from Italy and Slovakia. Abies spp. and Larix decidua were mentioned as its substrates. Here we select the best-preserved, fertile specimen of E. umbrinella from Stockholm as a lectotype of this species. Bourdot and Galzin (1927) reported E. umbrinella from France. Neuhoff (1935) published records of E. umbrinella from Central Europe which seem to belong to this species, except for his records on Pinus in Germany most likely referring to Ulocolla saccharina (see below). Here we report E. umbrinella from the Caucasus.

Authors 13

1. Viacheslav Spirin

   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

2. Vera F. Malysheva

   Komarov Botanical Institute of the Russian Academy of Sciences

   Affiliation as printed

   Komarov Botanical Institute, Prof. Popova str. 2, 197022 St. Petersburg, Russia

3. Nathan Schoutteten

   Universität Hamburg

   Affiliation as printed

   Organismic Botany and Mycology, Institute of Plant Science and Microbiology, Ohnhorststraße 18, 22609 Hamburg, Germany

4. Anton Savchenko Aachen Naturalis Biodiversity Center

   Naturalis Biodiversity Center

   Affiliation as printed

   Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, Netherlands

5. Bernard Rivoire
   Affiliation as printed

   Société Linnéenne de Lyon, 33 rue Bossuet, 69006 Lyon, France

6. Jan Olsson
   Affiliation as printed

   Österplana Skattegården 2, 53384 Hällekis, Sweden

7. Thomas Læssøe

   University of Copenhagen

   Affiliation as printed

   Globe Institute, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, Denmark

8. Leif Ryvarden

   University of Oslo

   Affiliation as printed

   Institute of Biological Sciences, University of Oslo, P. O. Box 1045, Blindern, N- 0316 Oslo, Norway

9. Django Grootmyers

   University of Tennessee at Knoxville

   Affiliation as printed

   Department of Ecology and Evolutionary Biology, University of Tennessee, 1406 Circle Drive, Knoxville, Tennessee 37996, USA

10. Matti Kulju

    University of Oulu

    Affiliation as printed

    Ecology and Genetics Research Unit, University of Oulu, P. O. Box 3000, FI- 90014 Oulu, Finland

11. Josef Vlasák

    Czech Academy of Sciences, Biology Centre

    Affiliation as printed

    Biology Centre, Academy of Sciences of the Czech Republic, Branišovská 31, CZ 37005, České Budějovice, Czech Republic

12. M. Victoria Vignale

    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

13. Ilya A. Viner

    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