Abstract
Leaf cuticles of Phoenicopsis and Arctobaiera collected from the Middle Jurassic Yima Formation, Henan Province, Central China were studied with transmission electron microscopy. The upper and lower cuticles are generally similar in ultrastructure. The cuticle is usually composed of two parts. The upper part is finely granular. The lower part is mainly fibrillar. In the upper cuticle there is normally a thin basal granular layer. The structure appears to be close to Type 3 of Holloway, but it has an inner granular layer and the fibrillae are usually more parallel in orientation. This type of cuticle is also different from those of the other fossil plants. This is the first time the ultrastructure of leaf cuticles of the Czekanowskiales has been studied. It is of interest that the two taxa of the same plant group bear a similar cuticular ultrastructure.
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