This function writes trees in a file with the NEXUS format.
}
\details{
- If several trees are given, they must have all the same tip labels.
+ If several trees are given, they must all have the same tip labels.
If among the objects given some are not trees of class \code{"phylo"},
- they are simply skipped and not written to the file.
+ they are simply skipped and not written in the file.
}
\value{
None (invisible `NULL').