sorus (plural sori). See [fruit-dot].
spadix. A spike of flowers (each flower usually minute), with a more or less fleshy axis, and usually accompanied by a spathe.
spathe. A corolla-like or involucre-like leaf or bract (or a pair of them) surrounding or accompanying a spadix. In the calla, the spathe is the large white flower-like part.
spermaphyte (“seed plant”). A seed-bearing plant; one of the flowering-plant class.
spike. A dense and slender flower-cluster in which the flowers open from below upwards.
sporangium (plural sporangia; spore-case). A body or receptacle holding spores.
spore. A reproductive or generative cell; in flowerless plants answering the purpose of a seed, but containing no embryo. It may not be the direct product of fertilization.
sporophyll (“spore leaf”). A member or part that bears spores.
sporophyte. The stage of the plant arising directly from the fertilized egg, and which ordinarily produces asexual spores (as the “plant” or conspicuous part of the fern or of a seed plant).
stamen. The pollen-bearing organ of the flower, of which the essential part is the anther (usually borne on a stem or filament).