The shoots are erect and up to 24 mm (1 in) long, each with two obovate, keeled, scales in the central portion and a pseudo-whirl of four leaves at the tip.

[1] In 2015 it was found on the coast of Brazil in the state of Paraíba on a sheltered bar at the mouth of the Mamanguape River.

[5] Where it is plentiful, as in Belize, it is sometimes found growing among the prop roots of mangroves, intermingled with Thalassia testudinum, Halophila decipiens, Halodule wrightii and Caulerpa spp..

Its greatest abundance is in the Placencia Lagoon in Belize, where it grows in dense monospecific stands.

In several places, such as in Colombia and Puerto Rico, its presence has been confirmed in the past but it has not been found recently.