Segmentation apicale et initiation foliaire chez Ceratopteris thalictroides (Fougère leptosporangiée)

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Abstract
In Ceratopteris the tetrahedral apical cell divides into segments from which the leaves are rhythmically initiated (one leaf every two segments). Leaf initiation is followed by intense activation of mitoses within the whole segment. In contrast, the 'empty' segments remain much reduced. As a consequence, distortion of the segmental pattern occurs, which explains certain phyllotactic phenomena. The schematic structure of the apex of Ceratopteris is compared with that of mosses. Analogies are suggested between the stipular scales of Ceratopteris and moss leaves and between fern leaves and moss branches.

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