Rock polypody

Rock polypody reproduces mainly by spores. These spores produce the male and female gametes the species needs to multiply.

Spore production begins in late spring and early summer, in May and June. It peaks from June through August and ends in September, depending on local climate conditions.

Once the spores have germinated and fertilization is complete, small green blades form on the undersides of the fronds. These structures are called prothalli. In sexual reproduction, the prothallus appears after about two weeks. It then takes roughly 22 weeks for a young frond to develop.

Rock polypody can also reproduce vegetatively, thanks to its creeping rhizome. Covered with brownish scales, it clings to rocks and forms dense colonies.