Tremella caloplacae (Zahlbr.) Diederich

Millanes, Ana M., Diederich, Paul, Westberg, Martin, Knutsson, Tommy & Wedin, Mats, 2014, Tremellarhizocarpicola sp. nov. and other interesting lichenicolous Tremellales and Filobasidiales in the Nordic countries, MycoKeys 8, pp. 31-41 : 36

Taxon classification Fungi Tremellales Tremellaceae

Tremella caloplacae (Zahlbr.) Diederich

Note.

New to Norway and to the Swedish province Torne Lappmark.

The species was at first tentatively described as Tremella sp. 1 by Diederich (1996) and eventually formally described by Sérusiaux et al. (2003). It has been reported from Austria, Canada, France, Great Britain, Greece, Greenland, and Spain ( Diederich 1996, 2007, Sérusiaux et al. 2003), growing inside the hymenia, or exceptionally on the thallus, of different Caloplaca species, viz. Caloplaca arenaria , Caloplaca arnoldii , Caloplaca aurantia , Caloplaca carphinea and Caloplaca saxicola ( Diederich 1996, Sérusiaux et al. 2003), and on the thallus of Xanthoria sorediata ( Diederich 2007). It was recently reported as new to the Nordic countries ( Thell et al. 2014) from two Swedish collections, growing on new hosts: Caloplaca decipiens (on the thallus; Fig. 1D) and Xanthoria parietina (inside the hymenium; Fig. 1E). Here it is reported on a new host ( Xanthoria elegans ), in Sweden. All samples below are on Xanthoria elegans , growing inside the hymenium or on the thallus. All specimens bear two-celled basidia (Fig. 1J) and are very similar microscopically. Further investigations are needed, however, to check if all specimens growing on Teloschistaceae belong to a single species.

Specimens examined

(all on Xanthoria elegans ): NORWAY. Oppland: Lom municipality, Runningsgrende, Kleive, 61°42.95'N, 8°14.05'E, 720-850 m, 29 June 2013, A. Millanes 808 (S: F-255312). - SWEDEN. Torne Lappmark: Jukkasjärvi par., Paddos, 68°19.16'N, 18°51.93'E, 625 m, 28 Aug 2013, A. Millanes 904 & M. Méndez (S: F-255313). Torne Lappmark: Jukkasjärvi par., Paddos, 68°19.13'N, 18°51.89'E, 596 m, 28 Aug 2013, A. Millanes 908 & M. Méndez (S: F-255314).