An integument (PO:0020021) which is the innermost of the two layers of tissue that usually cover the ovule, contiguous to the nucellus and usually contributing to the formation of the micropyle at the apex.
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).
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