Noun
In liverworts, the angle and orientation of the plane of the leaves with respect to the axis of the stem.
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The Chilean Amphijubula Schust. (Schuster, 1970a) which has the facies of a small Frullania and agrees with Frullania in leaf insertion and branching, has a nontiered seta with 16 epidermal cell rows surrounding 4 inner rows.