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(cross-section)

Cystoclonium purpureum

This highly variable Rhodophyte has a fleshy main axis with many thinner branches. Two fairly similar species are Gracilaria tikvahia and Agardhiella subulata. Cystoclonium and Agardhiella are distinguished from Gracilaria based on the cells in the medula of their thalli. Cystoclonium and Agardhiella have round medullary cells while Gracilaria has filamentous medullary cells. Cystoclonium is distinguished from Agardhiella by the single apical cell at the end of each branch.


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