degenerate megaspore Poaceae degenerate megaspore (narrow) PO:0000245 PO:0006495 plant_anatomy In monosporic and bisporic megasporogenesis: the megaspore(s) that would not participate in megagametogenesis. 退化大胞子、胞子形成に寄与しない大胞子 (Japanese, exact) megaspora degenerativa (Spanish, exact) If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352). megaspore