| 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.