Sporangia produce spores
. Microsporangia and megasporangia may be distinguished if different spore
types are produced. In the Ferns s. str.
, the sporangia are mostly located on the lower leaf
surface of the sporophylls
. In the Horsetails, the sporangia are located on the lower surface of table-shaped sporophylls
at the apices
of the stems
. In the Clubmosses, the sporangia are located on the upper surface of foliole sporophylls
which are mostly arranged in terminal strobili
(which are homologous to flowers
). In the Spermatophytes
the pollen sac
corresponds to the microsporangium and the nucellus
to a megasporangium.