brown seaweed

The water near the shore was full of jellyfish and brown seaweed.

Then off came many a layer of the rough brown seaweed fabric and afterward certain coverings of tough shark-skin neatly sewn.

With her trailing hand she drew a long, dripping spray of brown seaweed from the water.

A rock is always indicated by the masses of very long, yellowish brown seaweed which root on it and wave in the tide.