Write Tree File in Nexus Format
This function writes trees in a file with the NEXUS format.
write.nexus(..., file = "", translate = TRUE)
If several trees are given, they must have all the same tip labels.
If among the objects given some are not trees of class
they are simply skipped and not written to the file.
None (invisible `NULL').
Maddison, D. R., Swofford, D. L. and Maddison, W. P. (1997) NEXUS: an extensible file format for systematic information. Systematic Biology, 46, 590--621.