seminule

— Seminules appear to differ only from seeds by their minuteness. […] The seminules of cryptogamous plants are produced in ovaries to which stigmas are attached; but those of agamous plants are contained in a sort of ovary, to which no stigma being attached, they are disginguished by the peculiar name of conceptacles, either loose, or, as in some plants, in small cases called elytræ, the conceptacle itself then performing the office of an involucrum.