Grisellatheca
Grisellatheca was a genus of land plant with branching Glossary of [botanical terms#axis|axes]. It is known from charcoalified Early Devonian deposits, its type locality being the Brown [Clee Hill] lagerstatten. Its Terahedraletes spores form permanent tetrads.
Grisellatheca's internal anatomy comprises banded tubes, but it lacked an external cuticle. It shows some liverwort characteristics, and is hesitantly assigned to this group.