What is "grisellatheca"

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