Species of liverwort
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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.
References.
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