What is any seaweed with red spores. Note: As the name of a subclass, Rhodosperms, or Rhodospermeæ, is synonymous with Florideæ (which see.) called?

rhodosperm — Any seaweed with red spores. Note: As the name of a subclass, Rhodosperms, or Rhodospermeæ, is synonymous with Florideæ (which see.). (Webster's 1913.)

Sources