red algae

noun
marine algae of the phylum Rhodophyta, in which the chlorophyll is masked by a red or purplish pigment.

Origin:
1850–55

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World English Dictionary
red algae
 
pl n
Also called: red seaweed the numerous algae that constitute the phylum Rhodophyta, which contain a red pigment in addition to chlorophyll. The group includes carrageen, dulse, and laver

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

red algae

members of the division Rhodophyta (about 4,100 species), predominantly marine algae often found attached to other shore plants. Their morphological range includes filamentous, branched, feathered, and sheetlike thalli. In most species, thin protoplasmic connections provide continuity between cells. Their usual red or blue colour is the result of a masking of chlorophyll by phycobilin pigments (phycoerythrin and phycocyanin).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It's actually a gelatinous preparation of the cell walls of red algae, used to thicken the fruit filling.
One day, along the beach, tiny red algae blooms into a vast red tide.
Certain single-celled plants cells, such as green and red algae, have been themselves taken up by other cells to become plastids.
Red algae is also said to alter the perceived color of snow.
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