Lineage Through Time plot. Lineage Through Time (LTT) plot for liverworts (blue), mosses (green), ferns (purple), gymnosperms (yellow) and angiosperms (red) with indication of average global temperature  and cool climate modes (blue bars ). Triangles pointing up or down indicate diversification rate shifts as detected with LASER (increasing or decreasing, respectively, see Methods). (A) unconstrained tree; (B) constrained tree (i.e., angiosperms not older than 130 Ma). The y-axis indicates the number of lineages N on a logarithmic scale.