Iris Cohen schreef
They are called cotyledons, or seed leaves. They are the endosperm that
was inside the seed.

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Although I hate to spoil a good religious argument I feel dutybound to point
out that cotyledons are part of the embryo, and have nothing to do with
endosperm. Reserves can be in both the cotyledons and endosperm: this is
correlated with the systematic position of the taxon in question.
PvR