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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

habitats.

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.

Silurian

Page 16

Moss clump on a forest floor, Michigan.

Image courtesy of Andrew Lin.

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