Hi,
To add to Gerta's description.
R packages meta and metafor work in parallel. If you call
forest(ma.object), either R function forest.meta() or forest.rma() is
called internally depending on whether ma.object has been created with
meta or metafor.
However, it is essential that you have to have a look at the proper help
page for more information on forest.meta() or forest.rma().
You can get an overview using help(meta) or help(metafor), respectively.
For meta, you can than click on the link for the forest function or use
the R command help(forest.meta). For metafor the command is
help(forest.rma).
Best wishes, Guido