A brown alga of extremely rare occurrence Padinopsis adriatica Ercegović, was collected from the Arabian Sea coast at Karachi, Pakistan during March 2008 and investigated for its morphology, anatomy and reproductive structures in details. This is the first report of its occurrence in the Indian Ocean. The present specimens were slightly larger in length and breadth than the type specimens. Thallus was observed to grow by a margin of apical cells and there is lack of an inrolled margin which distinguishes it from the genus Padina. Anatomical features and reproductive structures observed in this study are new information for this species
