cophenetic.phylo computes the pairwise distances between the
  pairs of tips from a phylogenetic tree using its branch lengths.  dist.nodes does the same but between all nodes, internal and
  terminal, of the tree.
## S3 method for class 'phylo':
cophenetic(x)
dist.nodes(x)tip.label of the argument
  phy), or, in the case of dist.nodes, the numbers of the
  tips and the nodes (as given by the element edge).read.tree to read tree files in Newick format,
  cophenetic for the generic function