Hormophysa cuneiformis (J.F.Gmelin) P.C.Silva 1987

    Thalli yellowish to dark brown, 10–40 cm long, with a short, terete, stipe with few to many primary branches, each irregularly tristichously and spirally branched from the rhachis, with most laterals of more-or-less limited growth. Thallus attached by discoid to conical, holdfast, 4–12 mm across. Primary branches with triquetrously arranged wings, each 0.5–3.5 cm long and 2-7 mm broad and terminating with vesicles. Vesicles develop centrally within the medulla on the upper part of the branches. Lower part of branches usually denuded; vesicles elongate, 4–11 mm long and 2–5 mm in diameter. Secondary lateral 2–9 cm long, compressed to triquetrous, with marginal rows of short teeth 0.5–2.5 mm long, cryptostomata numerous, scattered. Apical cell occurs in an apical depression and filled with mucilage. Apical cells with three cutting faces. Internal structure shows medulla consists of 3-5 layers with spherical thick walled elongated cells, 30-58 µm in diameter. Cortex composed of 3-8 layers of isodiametric cells, 25- 45 µm in diameter, and decrease in size towards the surface. A single layer of meristoderm with more phaeoplasts, 8-24 µm in diameter. Vesicles with longitudinal strands of smaller cells opposite the wings.

    Thalli monoecious. Conceptacles bisexual, scattered over the thallus without distinctive receptacles; oogonia sessile, ovoid and broad based, 70–110 µm long and 28–55 µm in diameter. Antheridia sessile or on short, branched, paraphyses, elongate-ovoid, 15–33 µm long and 6–13 µ in diameter; simple paraphyses also present.