In the prothallus of a vascular cryptogam, the antherozoids

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature a different times. As a result

1. there is high degree of sterility
2. one can conclude that the plant is apomictic
3. self-fertilization is prevented
4. there is no change in success rate of fertilization

In the prothallus of a vascular cryptogams the antherozoids and eggs mature at different times which result in failure of self-fertilization.