part_of part of part of develops_from develops from develops from adjacent to adjacent to adjacent_to anther wall anther wall middle layer A portion of ground tissue (PO:0025059) directly internal to an anther wall endothecium (PO:0020002) that develops from an anther wall secondary parietal cell layer (PO:0006007). May be a single or double layer. Usually crushed by the endothecium and therefore almost invariably degenerates early during anther development. In some angiosperms, including <i>Arabidopsis</i>, it develops from an anther wall outer secondary parietal cell layer. In other angiosperms, it develops directly from an anther wall primary parietal cell layer, while in still others, two layers of the middle layer may develop from both an anther wall outer secondary parietal cell layer and an anther wall inner secondary parietal cell layer. PO:0004700 PO_GIT:358 PO_GIT:49 capa media (Spanish, exact) plant_anatomy 葯壁中間層 (Japanese, exact) anther wall secondary parietal cell layer anther wall endothecium portion of ground tissue