Horsetails

Horsetails

The Horsetails are an ancient group of plants that probably evolved from Psilophyte ancestors. They developed water-conducting tubes and rigid supporting tissues which made it possible for some species to reach a great size. With the Clubmosses and now-extinct Lepidodendrons, they made vast jungles of plant life which is today fossilised as coal. Only one genus of horsetails remains but its species are widespread mostly in the northern hemisphere. [CH] {FG}