Following up on a previous question/answer about ferns, I would
appreciate if someone could give me some help with two additional
question on the same subject:
1) Since the male and the female gametes of the fern develop on the
underside of the gametophyte, is it a necessary condition for the
successful travel of the male gamete that there is water to fill the
void between it and the ground, or at least that the water is high
enough at the female gamete to allow it to make contact?
2) If the male gamete is in fact 'dumped' into the 'sea' beneath it, is
its approach to the female gamete a random swim or is it attracted
specifically to the female gamete?