Retrieve the detailed information for the list of studies used in the Tree of Life.
source_list(tax, ...)# S3 method for tol_summary
source_list(tax, ...)
a data frame
a list containing a source_id_map slot.
additional arguments (currently unused)
This function takes the object resulting from
    tol_about(study_list = TRUE), tol_mrca(),
    tol_node_info(), and returns a data frame listing the
    tree_id, study_id and git_sha for the
    studies currently included in the Tree of Life.