part_of part of part of cardinal organ part sporangium sporangium wall sporangium jacket layer (exact) A cardinal organ part (PO:0025001) that is composed of the outer layers of a sporangium (PO:0025094) and bounds the archesporium (PO:0030074) or plant spores (PO:0025017). 2011-05-02T09:14:26Z plant_anatomy pared del esporangio (Spanish, exact) May have multiple layers such as exothecium, endothecium and tapetum. Early in development, the sporangium wall bounds the archesporium. Later, after spores develop from the archesporium, it bounds the spore or spores. rwalls PO:0025306 sporangium jacket layers (exact) 胞子嚢壁 (Japanese, exact)