| It is generally accepted that the earliest land plant
megafossil is that of a Silurian plant Cooksonia (ca. 420 Ma).
Biostratigraphic range of Cooksonia extends to the Devonian, and
specimens are found worldwide, including Britain,
Czechoslovakia, Siberia, North America, and Libya. Cooksonia,
however, contains several species that are possibly
polyphyletic. Other representative of early land plant is
Baragwanathia from the Silurian of Australia, though its
structure is fairly complex compared to other early land plants.