part_of part of part of cardinal organ part archegonium venter PO_GIT:306 vientre (Spanish, exact) rwalls PO:0030038 2011-04-12T11:00:43Z plant_anatomy 造卵器腹部 (Japanese, exact) After fertilization, the venter develops into the spore capsule calyptra (PO:0030037), which protects the sporangium (syn: spore capsule; PO:0025094) containing the developing sporophyte. A cardinal organ part (PO:0025001) that is the enlarged basal part of an archegonium (PO:0025126) and has an archegonium egg cell (PO:0025122) located in it.