Strobilus (pl. strobili) A group of sporophylls (spore-bearing leaves) arranged around a central axis, found in gymnosperms, Lycophyta (clubmosses), and Sphenophyta (horsetails).

• 球果：孢子叶向中轴聚拢形成的结构，存在于裸子植物门植物、石松亚门植物（石松）和木贼纲植物中（楔叶类）。