Distribution of different clades of CHD-containing Gypsy LTR retrotransposons in plants. Evolutionary tree is represented according to Bowman et al., 2007  and Berbee and Taylor, 2001  with minor modifications. Divergence times (Mya - million years ago) are indicated according to Hedges, 2002 . Data suggest that Tcn1-like LTR retrotransposons were horizontally transmitted between fungi and non-seed plants (indicated by arrows). Presumably HT took place among fungi and the last common ancestor (LCA) of mosses and lycophytes (indicated as 1). Alternatively, it is possible that two independent acts of HT occurred (indicated as 2). First HT event could happen among fungi and LCA of mosses since all investigated mosses contain Tcn1-like LTR retrotransposons. The second HT could occur among fungi and LCA of Selaginella since only representatives of this genus carry this group of retrotransposons among all the investigated lycophytes.