multicellular plant gametangium antheridium plant_anatomy PO:0025125 2010-11-15T08:58:31Z A multicellular plant gametangium (PO:0025124) that produces antheridium sperm cells (PO:0025120) and has as parts an antheridium jacket layer (PO:0030053) and an antheridium stalk (PO:0030035). anteridio (Spanish, exact) The antheridium (PO:0025125) occurs in bryophytes and pteridophytes, but never in gymnosperms or angiosperms, where male gametes are produced in the pollen (PO:0025281), a specialized (reduced) gametangium. 造精器 (Japanese, exact) rwalls antheridia (exact, plural) PO_GIT:211