The maki-sushis (first pic) are wrapped in nori paper, which is actually quite close to our dear Irish Moss.
Butthe gelatinous aspect comes from the starch of the rice, not from any seaweed.
Oblivious : I didn't forget it, the wasabi is between the rice and the salmon <!-- s:-) --><img src="{SMILIES_PATH}/icon_smile.gif" alt="

" title="Smile" /><!-- s:-) -->