Adenophorus periens, a member of the Polypodiaceae family, is a small, pendent, epiphytic (not rooted on the ground) fern usually growing on Metrosideros polymorpha (ohia) trunks. The rhizome (prostrate stem) is covered with small dark, stiff scales 2 to 4 cm (0.8 to 1.6 in) long. Its yellowish...