Here is a whole big thicket of oarweed kombu. In OR, no license is required for personal seaweed harvesting, although there is a limit of 10 lbs per person. For WA, you must obtain a license through the WA Dept. of Fish and Wildlife.  It's also important to check for closures or other health risks prior to harvesting. See this site for contacts for WA state. <a rel="nofollow" class="external text" href="http://wdfw.wa.gov/fishing/shellfish/shellfish_seaweed_rules.html">wdfw.wa.gov/fishing/shellfish/shellfish_seaweed_rules.html</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/38559542@N02">Leslie Seaton</a> from Seattle, WA, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/lacatholique/6118562625/">Oarweed</a>