Dear of troy: Back in the depression kids with boats used to make a good bit of money harvesting the right kinds of seaweed. One they called dulce. It was purplish and had fairly fine somewhat flattened multiply branched strands.
It is interesting that the Japanese first made monosodium glutamate from sea weed. I do very much like Accent in soups. The scare about "Chinese restaurant syndrome" twenty years ago must have been caused by gross misuse of it.