Most seaweeds are edible-but maybe not palatable--a few like Desmarestia are acidic or like Laurencia produce bromides--corallines are to calcareous -you might try those key words--or be more specific for what you are looking for--it would take a long time to compile a complete list
You can get the list from the Regional Centre of Central Marine Fisheries Research Institute - Mandappam Camp. Ramanathapuram District. Tamil Nadu.for the Southern species & from Fisheries Research Station of Junagadh Agrilcultural University - Port Okha - Dev Bhumi Dwarka District - Gujarat for the Western Indian region.You can also try NIO - Panaji- Goa.