https://northwest-lichenologists.wildapricot.org/page-1816539/177559057#photo
also, possibly of interest - encountered Simon Schwendener in odd new book “Do Plants Know Math” by Douady, Dumais, Golé and Pick. ((similar size and binding to books of Princeton University Press’s “The Lives of the Natural World” series, which includes Lücking and Spribille’s “The Lives of Lichens”)
“A botanist by training, Schwendener described his research as “physico-mathematical” .Phyllotaxis was a perfecft fit for his wide-ranging mind. He would peer through his microscope at real plant cells and then make leaps into brilliant abstractions. How exactly did he help explain why Fibonacci numbers appear in plants? Most importantly, he was the first to create a model for leaf placement using circles, an approach now known as disk-stacking. Remarkably, this model is still used today, with the added firepower of computer simulations.
…according to specialists, “plant biomechanics became a clearly defined field of study upon the poblication of Simon Schwendener’s seminal book, “The Mechanical Principle of the Anatomy of Moncotyledons” (as it would be in English).
