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Tumour-like calluses in red algae. Calluses in red algae can take on a variety of morphologies, including disorganized masses, illustrated here in (a) Ptilophora subcostata, (b) Carpopeltis affinis and (c) C. prolifera. Calluses are marked with a ‘c’; the explant (tissue of red algae) is marked with an ‘e’. Adapted with permission from Huang & Fujita [172].
