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A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in
Polysiphonia). The structure from which carpospores are released.
Maggs, C.A. and Hommersand, M.H. 1993. Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales. The Natural History Museum, London ISBN0-11-310045-0
