laminaria

It is found on rocks and Laminaria stems beyond the tide-marks, but is commonly washed up on the beach during storms.

A very small species (L. pusillus) with tufted green fronds grows parasitic on the fronds of Chorda and the stems of Laminaria.

Laminaria digitata, six feet long, is found here sometimes under these circumstances.

Sometimes one finds here fronds of Laminaria which have been washed ashore.

Fucus and Laminaria constitute the kelp from which iodine is obtained, and were at one time the source of the potash of commerce.