MEDUSA chronogram. Diversification chronogram with rate shifts located using MEDUSA  for different groups of land plants. Numbers correspond to the rate shifts located by MEDUSA being the numbers in increasing order from the highest to lowest net diversification rate (see Additional file 5). Different colours indicate different net diversification rates found in the tree. Boostrap support for the main nodes are indicated with one asterisk (> 70%) and two asterisk (50%-70%). Angiosperms (grey asterisk) have been simplified for this figure.