Epidermal structure of Podozamites leaves |
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| Abstract: | The genus Podozamites ranges from Late Triassic to Late Cretaceous and is widely distributed geographically. The epidermal pattern of the leaves of only two of the several species is clearly known. Collections from the Late Jurassic and Early Cretaceous strata in the Bureya basin have brought to light a number of Poclozamites species: P. lanceolatus (L. et H.) Schimp. , P. angustifolius (Eichw.) Schimp., P. aff. eichwaldii Schimp. , P. gramineus Heer, and P. ellipsoides Saporta. Among these collections only one form, P. aff eichwaldii, has the epidermal pattern preserved. Thus information on a third species of Podozamites is now available. The cuticle in this species is very thin. The leaf is hypostomatous. Epidermal cells on the upper surface are large, rectangular, in fairly distinct rows, and have straight, unevenly cutinized walls. The lower surface consists of alternating stomatal and astomatal bands, each band comprising six or seven rows of cells in width. The stomata are oriented at right angles to the veins and are not sunken. The cuticle of the material from the Bureya depression compares in general types with that of P. punctatus and P. cf. distans from Greenland. --F. M. Hueber. _ |
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