Each plant is a single, multinucleated cell. Laminaria saccharina Southern kelp Large, flat, brown blade that is ruffled along edges like lasagna noodles. Blades up to 1.5 m long attached to stalk-like stipe and secured to rocks by a branching holdfast. Found in the lower intertidal zone. Long, narrow, olive green branches attached firmly to rocks in the middle to lower intertidal zones.
Blades are oval-shaped in cross section with no ribs and single air bladders near tips.
Typically 50 cm long, but sometimes much longer. Provides a moist habitat for many smaller organisms. Rockweed Broad, flattened olive green blades firmly attached to rocks in the middle to lower intertidal zone. Blades are dichotomously branched with ribless air bladders in pairs. 1 m. Coralline alga Hard, pink, calcium-rich seaweed.