In heterosporous plants, the microspores give rise to small male prothalli bearing male sex organs (antheridia), and larger female sex prothalli bearing female sex organs (archegonia).

• 在具异形孢子的植物中，小孢子形成具小的雄性器官（精子器）的雄原叶体，而大孢子形成大的具雌性器官（颈卵器）的雌性原叶体。