Though it doesn't look like Codium,as they are green in color, you can contact Algal culture division of CSMCRI,or Centre of Advanced Studies in Botany, Madras University.
Brown algae belong to a very large group, the Heterokontophyta, a eukaryotic group of organisms distinguished most prominently by having chloroplasts surrounded by four membranes, suggesting an origin from a symbiotic relationship between a basal eukaryote and another eukaryotic organism. Most brown algae contain the pigment fucoxanthin, which is responsible for the distinctive greenish-brown color that gives them their name. Brown algae are unique among heterokonts in developing into multicellular forms with differentiated tissues, but they reproduce by means of flagellate spores and gametes, which closely resemble other heterokont cells. Genetic studies show their closest relatives to be the yellow-green algae.
With the help of the book "Study of seaweed diversity along the islands of Gulf of kutch" i have got the name of this species,its Iyengaria stellata (Børgesen) Børgesen