Tremella pertusariae 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 : 34-35

Taxon classification Fungi Tremellales Tremellaceae

Tremella pertusariae Diederich

Note.

This species was previously recorded in Europe (Belgium, France, Germany, Great Britain, Ireland, Italy, and Spain), where it is very common in the western Pyrenees, and in America (Mexico and U.S.A) ( Diederich 1996). Knutsson and Johansson (2011) reported it from Sweden, but with some hesitation since the material could not be identified microscopically. The five additional specimens reported here confirm the presence of the species in the Nordic countries. The fungus forms pale to dark brown or blackish galls, generally on the apothecia of Pertusaria hymenea (Fig. 1B), but also on the thallus of both Pertusaria hymenea and Pertusaria pertusa , and bears characteristic stalked basidia (Fig. 1H).

Specimens examined

(all on Pertusaria hymenea ). DENMARK. Jylland: Fredrikkshavn, W of Pikkerbakken, 20 June 1947, A.H. Magnusson 20958b (UPS: F-661189). - SWEDEN. Småland: Femsjö par., Femsjö, 1859, T.M. Fries (UPS: F-661180). Småland: Växjö par., Växjö, Jan 1880, E. Köhler (UPS: L-661177). Skåne: Oppmanna par., Bokenäset, July 1916, E.P. Vrang (S: F-131626). Skåne: Oppmanna par., Bokenäset, 19 July 1943, G. Degelius (UPS: L-661197). Öland: Ås par., Södra Ottenby lund, ”Skogsudden”, on ancient Quercus robur , in oak-dominated deciduous forest. 56°12.98'N 16°24.80'E 16 Feb 1999, T. Knutsson 99-092 (private herb.)