Tegmenticium Spirin & Viner 2026, gen. nov.

Abstract

Tegmenticium Spirin & Viner gen. nov. Etymology. From ‘tegmen’ (short version of ‘tegimen’) (Lat., noun), meaning a cover or a clothing, and Corticium, in reference to the crust-like basidiomata. Description. Basidiomata annual, effused, waxy-gelatinous, opaque, grayish-white. Hymenial surface smooth, covered by a grayish-white, easily removable pruina. Hyphal structure monomitic; hyphae clamped, hyaline or yellowish, agglutinated, basidia-bearing hyphae poorly differentiated. Crystals normally absent. Cystidia present, thin-walled, hyaline, usually clearly tapering. Hyphidia present, with a well-differentiated stem and richly branched, non-encrusted apical outgrowths, forming a continuous layer. Basidia four-celled, ellipsoid-ovoid to subglobose, sessile, thin-walled, embedded, occasionally with a reduced stalk-like base. Basidiospores thin-walled, broadly to narrowly cylindrical, curved. On dead wood of angiosperms. Generic type. Sebacina peritricha Bourdot & Galzin. This genus is introduced here for a single species, Exidiopsis (Sebacina) peritricha, which is currently synonymized with E. effusa. Our data (Figs 1, 2) show that these species should be treated separately and that they are not closely related. Tegmenticium peritrichum is different from other European species formerly treated under Exidiopsis due to its well-developed cystidia, as well as its rather small basidia and basidiospores. Its mature basidiomata are clearly gelatinized and covered by a whitish-grayish, easily removable deposit. Thus, they can be mistaken for E. effusa. The latter species, however, lacks cystidia and has larger basidia and, in most specimens, longer basidiospores. Moreover, it possesses spine-like outgrowths on its hymenial surface, although they can be detected only in fresh or rehydrated specimens. Differences of T. peritrichum from the outwardly similar Exidia repleta and E. saturata are discussed above, under E. repleta. Proterochaete abstrusa occasionally bears cystidia which are similar to those of T. peritrichum. However, P. abstrusa can be easily recognized due to its slenderer basidiomata, larger basidiospores and basidia, as well as thicker sterigmata. See further notes under Ulocolla corticioides.

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