Large, slow-growing almost tree-like ferns. Rhizome thick, erect, slender, trunk-like. Sterile and fertile fronds similar. Fronds divided twice, evergreen, thick. Sori in a line each side of the vein in ultimate segments. Indusium flap-like, joined on the outer side.

6 or 7 species endemic to Hawaii.

Spores.

Tree-fern-like habit; indusium continuous alongside midrib.

Source: Spencer, R. (1995). Blechnaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 1, Ferns, conifers & their allies. The identification of garden and cultivated plants. University of New South Wales Press.