reproductive structure - the parts of a plant involved in its reproduction

macrosporangium, megasporangium - a plant structure that produces megaspores

microsporangium - a plant structure that produces microspores

eusporangium - a sporangium that arises from a group of epidermal cells

leptosporangium - a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns

tetrasporangium - a sporangium containing four asexual spores