Bacterial symbiont composition in three Saccharina japonica forms (TYP, LON, and SHA) and in three other laminarialean algae, Tauya basicrassa (TAY), Arthrothamnus bifidus (ART), and Alaria marginata (ALA).

For abbreviations, see Material and Methods. Total number of phylotypes (using 97% criterion of similarity) for each of the three S. japonica forms and three additional species are shown in parentheses at the top. A, B, C, and D: different phylotypes within a bacterial genus.