Fig. 2. Foliar concentrations of Hg reported in studies from Europe (Bombosch, 1983; Barghigiani et al., 1991; Makovská, 1996; Munthe et al., 1998) and North America (Fleck et al., 1999; Grigal et al., 2000; Lindberg, 1996; Moore et al., 1995; Rasmussen et al., 1991; Rasmussen, 1994b, 1995; Zhang et al., 1995a) (n = 63). This is only a snapshot of the extensive data that exist.