Abstract
Paracyathocaulis ogurae gen. et comb. nov. andCyathocaulis yezopteroides sp. nov. are Late Cretaceous tree-fern stems with cyatheaceous affinity. They are comparable with the Recent scaly cyatheoids (Cyathea s.l.), as well as with the Cretaceous and Tertiary fossil stems that have similar anatomy. All of these tree ferns, including the Late Jurassic to Early CretaceousOguracaulis Tidwellet al., comprise a well-defined morphological complex within Cyatheaceae, and are considered to be monophyletic. The taxonomy of this complex is analyzed cladistically, and the cladogram is phylogenetically evaluated by reference to the chronological data of fossils.
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Nishida, H. Structure and affinities of the petrified plants from the Cretaceous of Japan and Saghalien, V. Tree fern stems from Hokkaido,Paracyathocaulis ogurae gen. et comb. nov. andCyathocaulis yezopteroides sp. nov.. Bot Mag Tokyo 102, 255–282 (1989). https://doi.org/10.1007/BF02488568
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DOI: https://doi.org/10.1007/BF02488568