six species of sargassum c. agardh (sargassaceae) with compressed primary branches, including: s. binderi sonder, s. aquifolium (turner)c. agardh, s. oligocystum montagne, s. swartzii (turner)c. agardh, s. crassifolium j. agardh and s. cristaefolium c. a. agardh, were identified in the persian gulf and oman sea coasts, among which s. binderi is reported as newly recorded species in iran for the...