Term:
Lower septum
Lower septum
Definition:
A wall-like partition of a locule located basally to an articulation (often only seen as a thin line), as seen in longitudinal section, that separates it from an upper septum.
A wall-like partition of a locule located basally to an articulation (often only seen as a thin line), as seen in longitudinal section, that separates it from an upper septum.
Notes:
In neotropical Lecythidaceae, the septa, as viewed in a medial longitudinal section of the ovary, are articulate. That part of the septum above the articulation is called the upper septum and that part below is called the lower septum. The placentae arise from the the lower septum. In indehiscent dehiscent fruited Lecythidaceae the upper septum and it is especially developed in cylindric- fruits species of the genera Cariniana, Allantoma, and Couratari. In this genera, the operculum and the columella are tack-shaped.
In neotropical Lecythidaceae, the septa, as viewed in a medial longitudinal section of the ovary, are articulate. That part of the septum above the articulation is called the upper septum and that part below is called the lower septum. The placentae arise from the the lower septum. In indehiscent dehiscent fruited Lecythidaceae the upper septum and it is especially developed in cylindric- fruits species of the genera Cariniana, Allantoma, and Couratari. In this genera, the operculum and the columella are tack-shaped.