Finally, the actual reproductive parts form the innermost layers of the flower. These leaf primordia become specialised as sporophylls , leaves that form areas called sporangia , which produce spores, and cavitate internally. The sporangia on the sporophytes of pteridophytes are visible, but those of gymnosperms and angiosperms are not. In the angiosperms there are two types. Some form male organs ( stamens ), the male ( microsporangia ), producing microspores . Others form female organs ( carpels ), the female ( megasporangia ) which produce a single large megaspore .  These in turn produce the male gametophytes and female gametophytes
Each host name is followed in brackets by the name of the plant family to which it belongs. Assignment of plant genera to families follows Watson and Dallwitz, 1991 ; and Watson and Dallwitz, 1992 onwards . In particular, note the use of `traditional' names, such as Graminae rather than Poaceae, and Cruciferae rather than Brassicaceae. Devotees of Cronquistian classification should note that rather `narrow' definitions of families (., a tendency for splitting rather than lumping) are used herein, particularly within the Liliaceae sensu lato . Also note that within the Leguminosae, membership within one of the three large sub-families (Caesalpinioideae, Mimosoideae and Papilionoideae) is indicated.