Crateritheca crenata
General description:
Hydrorhiza tubular, winding. Stem with 4-6 deep proximal annulations, followed by a short athecate internode below first branch. Internodes 0.13-0.26 mm long, 0.04-0.06 mm in diameter at node.
Distribution:
Southern Australia (South Australia and Victoria)
Habitat:
Subtidal, epiphytic on algae.