Supplement to: Lang, Simone I; Cornelissen, Johannes H C; Shaver, Gauis R; Ahrens, Matthias; Callaghan, Terry V; Molau, Ulf; ter Braak, Cajo J F; Hölzer, Adam; Aerts, Rien (2012): Arctic warming on two continents has consistent negative effects on lichen diversity and mixed effects on bryophyte diversity. Global Change Biology, 18(3), 1096-1107, https://doi.org/10.1111/j.1365-2486.2011.02570.x