Cystocarp

noun

1. The sexual fruit of algæ of the order Florideœ, consisting of spores either without a special membranous envelop or contained within a conceptacle or pericarp. Also cryptocarp, sporocarp.
2. A minute vesicle in a red seaweed, which contains the reproductive spores.
3. A minute vesicle in some seaweeds, containing the reproductive spores.