Ancient Ferns
Believe it or not, these tiny kidney-shaped leaves belong to a species of fern, Adiantum reniform e. This is a very ancient species, dating from an "antediluvian" time, cooler than today, with a widely dispersed population that has given rise to different subspecies in different parts of the world.
Cubo de la Galga, La Palma island, Canary Islands. Spain.