Revision of Protopteris and Oncopteris tree fern stem casts from the Late Cretaceous of Central Europe
Adam Halamski, Jiří Kvaček, Josef Greguš
Stem casts of tree ferns from the genera Protopteris STERNBERG and Oncopteris DORMITZER in KREJČÍ from the Czech Republic and Poland are revised. A new species, Protopteris maletinensis GREGUŠ et J. KVAČEK sp. nov. from the Peruc-Korycany Formation (Cenomanian) is described based on material from Starý Maletín. Its morphological similarity to other species of the genus is discussed. The genus Protopteris and two species P. punctata (STERNBERG) C. Presl in Sternberg and P. singeri (GÖPPERT) C. PRESL in STERNBERG 1838 are revised and emended based on biostatistical analysis (i.e, width/height ratio of leaf scars), as this character has proved to be quite stable and can be used in species recognition. Genera Oncopteris DORMIZER in KREJČÍ and Alsophilina DORMIZER in KREJČÍ with their types O. netwallii and A. kauniciana are revised. These two so far described genera and species are united and ascribed to the genus Oncopteris with the type O. netwallii.