Endothecium

noun

1. The inner tissue of an anther or a moss capsule.
2. In botany: The inner lining of an anther-cell.
3. In mosses, the central mass of cells in the rudimentary capsule, from which the archespore is generally developed.
4. The inner lining of an anther cell.
5. The tissue found in the walls of anthers, and in moss capsules