bryophytes, lichens and filmy ferns ("hymenophyllaceae"), thrive in the humid oceanic climate. species with restricted atlantic distributions grow in the woods. the bryophytes in these woods are perhaps the best-developed atlantic bryophyte community in europe. the remote glaism na marbh valley has a particularly rich flora of bryophytes, some of which are scarce or absent in other parts of the woods. mosses, ferns and liverworts frequently occur as epiphytes, attached to the trunks and branches of oak trees. rare species growing in the woods include "cyclodictyon laetivirens", "daltonia splachnoides", "lejeunea flava", "radula carringtonii", and "sematophyllum demissum".