Description

 Halopteris filicina is a greenish-brown, fern-like seaweed that grows up to 10 cm in height. A number of individual stems, that are elongate and pointed towards the tip, grow from a holdfast that has a root-like appearance. Each stem bears alternately-placed side branches that, in turn, each bear short, pinnate branchlets. The density of these branches increases towards the upper part of the stem. Reproductive sporangia are ovoid in shape and positioned singularly at the axis of branchlets on short stalks.Halopteris filicina is similar to Halopteris scoparia but is less bushy in appearance.