(1) Generative cell $ \rightarrow $ Body cell $ \rightarrow $ Antheridial cell $ \rightarrow $ Antherozoids
(2) Tube cell $ \rightarrow $ Antheridial cell $ \rightarrow $ Stalk cell $ \rightarrow $ Antherozoids
(3) Antheridial cell $ \rightarrow $ Stalk cell $ \rightarrow $ Tube cell $ \rightarrow $ Generative cell
(4) Antheridial cell $ \rightarrow $ Generative cell $ \rightarrow $ Body cell $ \rightarrow $ Antherozoids