A phyllome lobe (PO:0025514) that is a projection on a leaf lamina margin (PO:0025009) for which the corresponding leaf sinus (PO:0025384) extends one quarter or more of the distance to the center of the long axis of the leaf lamina (PO:0020039). [source: JSTOR:2441319]
Comment
A leaf lobe may be either rounded or angular at the tip, and may have leaf teeth (PO:0025518) or leaf crenae (PO:0025519) on its margin. The corresponding leaf sinus may be rounded or angular.