Tarrantia is a form genus of small fossil plants of Early Devonian age.

The diagnostic characters are naked parallel-sided axes branching isotomously, terminating in solitary elliptical to ovate sporangia with height greater than width.

[1] The relationships of the genus are not clear because many anatomical details remain unknown.

[2] The only known species is from Wales.

This article related to a Devonian plant is a stub.