Phaeoceros squamuligerus (thalloid liverwort) (CC BY 2.0) Jason Hollinger/flickr.com, cropped

Scientific Name: Anthocerophyta

Status: Extant (alive today)

Oldest fossil anywhere: Cretaceous of Australia (about 135 million years old)

Oklahoma fossil record: There are no reported macrofossils of hornworts from Oklahoma.

Hornworts are small plants that live in damp habitats. Like liverworts and mosses, they do not have seeds, roots or vascular tissue, but hornworts also do not have leaves.

Hornworts use spores to reproduce.

Hornworts are rarely more than 1 inch (2.5 centimeters) tall.