With respect to plants, it has long been known what enormous ranges many fresh-water, and even marsh-species, have, both over continents and to the most remote oceanic islands.
Landareei dagokienez, aspaldidanik jakina da zein hedadura eskerga duten ur gezatako eta are itsas padurako espezie askok, hala kontinenteetan nola irla ozeaniko urrunenetan.