The bladders are filled with air, and children like to squeeze them to hear their pop. These bladders cause the plant to float upright, thus keeping all its sides in contact with water.
Nodose Rockweed (Ascophyllum nodosum)
Thin, round stem No central midrib
When dried by the sun, this plant makes an interesting and lasting souvenir, for it turns a lustrous black.
Common Kelp (Laminaria agardhii)
Broad, flat blade Several feet in length
The kelps of the Pacific grow several hundred feet in length, making them the largest of the algae and among the very largest plants.
