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Abstract
A unicellular marine red alga, Rhodella maculata gen. nov., sp. nov., is described with the aid of light and electron microscopy. The organism differs sufficiently from any previously known red alga to justify the setting up of a new genus to receive it, though the resemblance to Porphyridium warrants its inclusion within the Porphyridiaceae in the Porphyridiales of the Bangiophycidae. Aspects of the ultrastructure of special interest include observations on superficial ER and on the attributes of the pyrenoid which is penetrated by membrane-bounded projections from the nucleus.
