• An alternately produced form of certain cryptogamous
    plants, as ferns, mosses, and the like, which bears antheridia and
    archegonia, and so has sexual fructification, as contrasted with the
    sporophore, which is nonsexual, but produces spores in countless
    number. In ferns the oophore is a minute prothallus; in mosses it is
    the leafy plant.