Resam fern, 芒萁, Dicranopteris linearis
plentiful in Volcanoes National Park, Hawai'i Island
Native (yay!), forming extensive thickets at high elevation
Dicranopteris linearis is a common species of fern known by many common names, including Old World forked fern and uluhe (Hawaiian). It is one of the most widely distributed ferns of the wet Old World tropics and adjacent regions, including Polynesia and the Pacific. In parts of the New World tropics its niche is filled by its relative, Dicranopteris pectinatus.