F. foliacea is often mistaken for seaweed, however, closer inspection of the fronds will reveal the very apparent zooids, confirming the colony as an animal species. Several other bryozoans are similar in shape and habitat to F. foliacea including other species of Flustra and Carbasea carbasea. In particular F. foliacea may be confused with Securiflustra securifrons (narrow-leaved hornwrack), but may be distinguished by broader fronds than S. securifrons. Additionally, the fronds of S. Securifrons are typically divided into wedge-shaped segments, unlike F. foliacea.
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