Phyllotaxis, ontogeny, and CT imaging: Old and new approaches to understanding optimal seed packing in Middle Jurassic Araucaria mirabilis cones.

BACKGROUND AND AIMS: Fibonacci spiral phyllotaxis is overwhelmingly the most common leaf arrangement among plants, both today and in the fossil record. Spiral phyllotaxis appeared as early as the Late Devonian, some 380 million years ago. This mathem…

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