Reconstruction of Cooksonia caledonica
Early Devonian. Scotland. Redrawn based on D. Edwards (1970).

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.
(4) The earliest land plant Cooksonia