a Four strains (S, K, O and C) of Cladosiphon okamuranus have distinctive morphologies. Scale bars, 5 cm. b Locations from which the four strains were isolated since 2008 in Okinawa, Japan. Scale bar, 10 km. c A diagram showing the life cycle of C. okamuranus. This alga has n and 2n generations. C. okamuranus is cultivated and sporophytes are harvested for market. Genomic DNA was extracted from 2n germlings, while RNA was extracted from 2n germlings and 2n sporophytes.