Mertensia emarginata Brack.; Dicranopteris dichotoma (Thunb.) Bemh. var. emarginata (Brack.) Hillebr.; D. emarginata (Brack.) W. J. Rob.; D. emarginata var. inaequalis O. Deg. & I. Deg.; D. hawaiensis (as "kawaiensis") (Nakai) C. Chr.; Gleichenia dichotoma (Thunb.) Bemh. var. emarginata (Brack.) Hillebr.; G. dichotoma var. tomentosa Luerss.; G. emarginata (Brack.) T. Moore; G. hawaiensis sensu C. Chr., non Brack.; M. hawaiensis sensu Nakai, non Brack.

Endemic

Latin emarginatus, notched at the apex, without a margin, in reference to the emarginate tips of the segments.

Found on all major islands, usually at higher elevations than Dicranopteris linearis, except on the island of Hawai'i, where it is found as low as 50 m.

Dicranopteris linearis f. emarginata dif-fers from forma linearis by the heavy, wooly hairiness of its fronds, and by slightly emarginate segment tips. There is a continuum of intermediates between this form and forma linearis.