Common flapjack

Carpophyllum maschalocarpum, commonly known as flapjack, is a brown alga that grows in crevices of rocks at low tide levels. It is a common alga in New Zealand. They don't have branches, leaves or flowers like land plants. They are attached to rocks, not by roots, but by holdfasts. They have flexible stems and their tops are called fronds. Many look and feel like leather and usually have air-filled bladders or spongy cells inside the stems...