BMC Plant Biology MS: 1421915305624023 DNA variation in the phenotypically-diverse brown alga Saccharina japonica Evgeniy S. Balakirev, Tatiana N. Krupnova and Francisco J. Ayala The specimens of Saccharina japonica morphological forms were collected from the Primorye coastal region, Sea of Japan. The specimens of the TYP and SHA forms were collected near the Cape Dal'niy at depths of 6.0 m and 0.5 m, respectively. The specimens of the LON form were collected near the Cape Zolotoi at depths of 15.0 m. We also analyzed first year individuals belonging to the Saccharina japonica typical form (TYPF), collected near the Cape Dal'niy; unidentified Saccharina species (CHE; depth of 0.5 m), TYP form growing in close proximity with unidentified Saccharina species (TYPA), and a sample of the TYP form without middle line (TYPW), all collected in the Bay Chernoruch'e near the Cape Khitrovo, the Sea of Japan. The coordinates are: 1-1829: rbcLS; 1830-3624: COI; 3625-4317: ITS.