Colonies form a bushy clump of flat radiating fronds with terminally rounded lobes. Since F. foliacea is only lightly calcified, the colony as whole is flexible, allowing it move with the current. Zooids are approximately rectangular in shape and are arranged “back to back” to form bilaminar sheets. The frontal surface of the zooids is entirely membranous with no gymnocyst or cryptocuste preesnt. Four to five short, thick spines are arranged around the edge of the zooids. The polypide has13-14 tentacles and avicularia are present.
Colonies exhibit a degree of morphological plasticity, with frond width, and hence drag resistance, varying. Frond width is thought to be related to current speed.
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