Molecular and Morphological Evidence Challenges the Records of the Extant Liverwort Ptilidium pulcherrimum in Eocene Baltic Amber.
Preservation of liverworts in amber, a fossilized tree resin, is often exquisite.Twenty-three fossil species of liverworts have been described to date from Eocene (35-50 Ma) Baltic amber.In addition, two inclusions have been assigned to the extant species Ptilidium pulcherrimum (Ptilidiales or Porellales).However, the presence of the boreal P.pulch