Strobilus

The strobilus in Selaginella is the sporangia-bearing region of the sporophyte. The sporangia arise in the axils of leaves called the sporophylls.

As a term, female strobilus refers to the stage prior to pollination... The strobilus emerges slowly from its bud then its scales flex open. Once pollinated the strobilus now becomes a conelet. At fertilization the conelet becomes a cone.