A cardinal organ part (PO:0025001) that is the elongated, apical part of an archegonium (PO:0025126). [source: ISBN:0962073342, ISBN:9780070588493]
Comment
Early in development, the archegonium neck is occluded by a single row of neck canal cells (PO:0030065). At maturity, the neck canal cells (PO:0030065) and the ventral canal cell (PO:0025524) disintegrate, creating a archegonium neck canal (PO:0030066) for the plant sperm cells (PO:0000084) to enter the archegonium (PO:0025126).