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Synopsis
On Some Abnormal Cones Of Pinus Pinaster by Alexander Dickson. This classic 19th-century study examines irregular spiral arrangements in fir cones, with a focus on Pinus Pinaster. Dickson surveys the ordinary spiral systems and the rarer conjugate forms (bijugates and trijugates), detailing cases where secondary spirals converge or coalesce along cones described as I–V. He discusses observed cones from various sources, including Smyta, Muirhouse, and the lambertiana specimen, and analyzes how partial fusion of adjacent scales can alter the apparent spiral pattern. The author rejects simplistic abortion or fusion explanations and introduces a method for numbering scales around points of convergence to minimize ambiguity. He explores affinities between different spiral systems and discusses whether the differing spirals may derive from a common fundamental arrangement, suggesting convergence as a potential route. Plates and diagrams illustrate the described cones and the concept of convergence, contributing to understanding deviations from ordinary spiral patterns in Pinus cones and related structures.
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On Some Abnormal Cones of Pinus Pinaster
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