Plants Invade the Land
By the Early to Middle Ordovician, certain green algae seem to have evolved into tiny moss-like plants that grew in wet places on land.
We have fossils of spores, cuticles, and tubes.
The first upright plants likely existed by the Late Silurian.
Probably restricted to marshy
Basically a rigid stem with no
roots, leaves or vascular tissue.
Dispersed by spores.
Vascular tissue evolved by the Late Silurian, before roots or leaves appeared.
Moss clump on a forest floor, Michigan.
Image courtesy of Andrew Lin.