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Order Rhodymeniales

Family Lomentariaceae

Lomentaria Lyngbye

Thalli hollow, anatomy of pseudoparenchymatous cortex lined internally with filamentous medulla. Septa, where present, cellular, partitioning the central cavity and dividing axes into segments. Tetrasporangia tetrahedrally divided, arranged in sori sunken in cavities in the cortex. Carpogonial filaments 3-celled, almost all cells of the carposporophyte developing in to carposporangia.


Key to the species

1a. Axes divided into segments by regular constrictions; axes with hooked tips

Lomentaria amplexans

1b. Axes without regular constrictions and without hooked tips


2a. Mature axes up to 750 µm in diameter

Lomentaria corallicola

2b. Mature axes 1-1.5 mm in diameter

Lomentaria diffusa


Cite this record as:

Anderson RJ, Stegenga H, Bolton JJ. 2016. Seaweeds of the South African South Coast.
World Wide Web electronic publication, University of Cape Town,; Accessed on 02 March 2024.