Dragon Kelp - Eualaria fistulosa by Alexander Semenov Via Flickr: Here is an incredible giant kelp, Eualaria fistulosa, also called 'Dragon kelp'. Up to 25 metres long, it attaches to large rocks with the holdfast (a root-like structure) and rises to the surface. The midrib has gas-filled chambers that hold the whole thing up in the water.












