Pallaviciniites
Encyclopedia
The lowermost Upper Devonian fossil Pallaviciniites was for a time the oldest known liverwort until Metzgeriothallus
was recovered from earlier Devonian strata.
It had a central axis, and bifurcated at its tips; similar fossils have been found in younger strata through to the Pleistocene. With the exception of its elongated axial conducting (non-vascular) cells, the thallus was a single cell thick. It had a serrated margin.
Prior to its discovery, the oldest known liverworts dated to the Lower Carboniferous.
Metzgeriothallus
Metzgeriothallus sharona is the oldest known liverwort fossil, dating to the Middle Devonian. It is a simple, thalloid organism. M. metzgerioides is known from more fragmentary material dating to the Carboniferous of Scotland....
was recovered from earlier Devonian strata.
It had a central axis, and bifurcated at its tips; similar fossils have been found in younger strata through to the Pleistocene. With the exception of its elongated axial conducting (non-vascular) cells, the thallus was a single cell thick. It had a serrated margin.
Prior to its discovery, the oldest known liverworts dated to the Lower Carboniferous.