Aberrant phyllotactic patterns in cones of some conifers: a quantitative study

Veronika Fierz

Abstract


The scale patterns of 6000 cones from one single tree of Pinus nigra Arn. have been examined. Apart from the main Fibonacci pattern with 8 and 13 parastichies, nine aberrant spiral patterns with Fibonacci-type sequences have been found. They are quite rare and occur with different frequencies. The parastichy quotient 8/13 of the prevalent pattern is very close to the golden ratio 0.618. In case of the black pine  it appeared that the greater the deviation of the parastichy quotient m/n from 0.618, the rarer the pattern. Similar results obtained for the sample of 1506 cones collected from three individual trees of larch (Larix decidua Mill.) suggest a true correlation between the frequency of a pattern and the deviation of its parastichy quotient from the golden ratio.

Keywords


phyllotaxis; phyllotactic diversity; Pinus nigra Arn.; Larix decidua Mill.; rare cone patterns; Fibonacci-type sequences; golden ratio

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DOI: https://doi.org/10.5586/asbp.2015.025

Journal ISSN:
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  • 0001-6977 (print; ceased since 2016)
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Polish Botanical Society