Digital reconstructions of the ancient plant offer clues to the origins of leaf patterns in modern plants.
In plants with spiraling patterns of leaves, all the leaves can be described by a set of curved lines that spiral clockwise out from the center as well as by a set of curved lines that spiral counterclockwise. If the numbers of clockwise and counterclockwise curves are both numbers found in the Fibonacci sequence, it’s known as Fibonacci spiraling.between leaves or other plant parts . The patterns could also arise from the distribution of auxins, a type of plant growth hormone.
The fossils were obtained from the Rhynie chert, a roughly 400-million-year-old deposit of sedimentary rock in Aberdeenshire, Scotland, that contains exceptionally well-preserved fossils of some of the first land plants. In 1969, researchers collected hundreds of cross-sectional images offossils and the surrounding rock. Hetherington’s team digitally reconstructed the cross sections into 3-D representations of the original plants.
The leaves on the other two plants didn’t grow in spirals at all — instead, they grew in a series of rings stacked along the stem.
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