A canal (PO:0025132) in the center of an archegonium neck (PO:0030039). [source: ISBN:0962073342]
Comment
During archegonium development, the archegonium neck canal cells (PO:0030065) and the ventral canal cell (PO:0025524) disintegrate, creating a archegonium neck canal for the plant sperm cells (PO:0000084) to enter the archegonium (PO:0025126).