write.tree(phy, file = "", append = FALSE,
digits = 10, tree.names = FALSE)file = "", none (invisible
NULL) otherwise. If tree.names == TRUE then a variant of the Newick format is
written for which the name of a tree precedes the Newick format tree
(parentheses are eventually deleted beforehand). The tree names are
taken from the names attribute if present (they are ignored if
tree.names is a character vector).
Olsen, G. Interpretation of the "Newick's 8:45" tree format standard.
read.tree, read.nexus,
write.nexus