Man pages matching name bio::tree::treefunctionsi in section 3pm:

Bio::Tree::TreeFunctionsI.3pm.en	debian 10 / libbio-perl-perl
Bio::Tree::TreeFunctionsI.3pm.en	debian 11 / libbio-perl-perl
Bio::Tree::TreeFunctionsI.3pm.en	debian 12 / libbio-perl-perl