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.

First megafossil evidence of Cyatheaceous tree fern from the Indian Cenozoic

“…Later, Ogura (1941a, b) described a number of taxa, viz., Cyathocaulis tateiwai, C. yabei from the early Cretaceous of Korea and Philippines, and Cibotium iwatense from the late Cretaceous of Japan. Other Cretaceous genera with cyatheaceous affinity are Cauloperis brownii from England (Renault 1883), Yezopteris polycycloides, Cyathocaulis yezopteroides, Cibotiocaulis from Japan, Saghalien, and Korea (Nishida 1981a(Nishida , 1989, Oguracaulis banksii from Tasmania (Tidwell et al 1989), Conantiopteris schuchmanii from California (Lantz et al 1999) and Rickwoodopteris hirsuta from western North America (Stockey and Rothwell 2004).…”

Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica

“…Some fossil taxa generally referred to Cyatheaceae s.s., such as Paracyathocaulis H. Nishida 1989, Cyathocaulis Ogura emend. H. Nishida 1989 and Cibotiocaulis Ogura emend.…”

“…H. Nishida, 1989 are dictyostelic. However, these taxa have meristeles which in cross section curve towards the pith at their margins (Nishida, 1989), whereas in Cyatheales indet. the margins of the meristeles are centrifugally oriented.…”

Alienopteris livingstonensis gen. et sp. nov., enigmatic petrified tree fern stem (Cyatheales) from the Aptian Cerro Negro Formation, Antarctica

“…Alsophilocaulis calveloi Mene ´ndez (1961), Dendropteridium cyatheoides Bancroft (1932), Paracyathocaulis ogurae Nishida (1989), Cibotiocaulis tateiwai Ogura emend. Nishida (1989), and the species included in the Early Cretaceous genus Cyathocaulis Ogura emend.…”

“…Alsophilocaulis calveloi Mene ´ndez (1961), Dendropteridium cyatheoides Bancroft (1932), Paracyathocaulis ogurae Nishida (1989), Cibotiocaulis tateiwai Ogura emend. Nishida (1989), and the species included in the Early Cretaceous genus Cyathocaulis Ogura emend. Nishida (1989) (C. naktongensis Ogura (1927, C. yabei Ogura (1941), C. nihei-takagii Nishida and Nishida (1983), and C. yezopteroides Nishida (1989)) are generally included in the Cyatheaceae, and can be differentiated from Alienopteris livingstonensis by the absence of medullary bundles in the latter taxon.…”