Fig. 3. Diagram of a Calliarthron frond after it has been broken. (A) Broken genicula were numbered according to their original position in the frond. Data from each broken geniculum was paired with the planform area of the frond that it would have supported in flow (e.g. encircled segments would be paired with geniculum no. 24). (B) Transverse view of a broken frond segment.