期刊
PALEONTOLOGICAL JOURNAL
卷 41, 期 2, 页码 198-206出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S0031030107020104
关键词
phylloclades; peltasperms; conifers; leaf origin; Permian; Russian Platform
类别
Phylloclades from the Upper Permian (Tatarian) deposits of the Sokovka locality, Vladimir Region, showing gradational transformation of a planate scale-leaved shoot into a foliar organ, are assigned to the new genus Permophyllocladus (Peltaspermales?). The phylloclades are distinctly dorsoventral: scaly leaves and their rudiments are developed on the lower side and are only marked by suture lines on the cuticle of the opposite side. In epidermal characteristics, the phylloclades are similar to the leaves of peltasperms from coeval deposits. It is supposed that peltasperm leaves are of phylloclade origin and were formed by cohesion of units of a coniferoid scale-leaved shoot that resembles shoots of the Mesozoic family Hirmerellaceae (Cheirolepidiaceae), which also tend to develop phylloclades.
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