Marginal Wood Fern – Dryopteris marginalis

by | Dec 9, 2023 | Ferns, NE Native Ferns

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Original file ‎(SVG file, nominally 750 × 500 pixels, file size: 152 KB)

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English: The only illustration in Charles Darwin's 1859 On the Origin of Species, showing the divergence of species. Caption: Diagram of Divergence of Taxa. The letters A–L represent distinct descents. Each horizontal line represents 1000 generations. Descent A has 3 existent species after 10000 generations. Descent I has 2. Descents E, F have 1 each. The other descents have gone extinct. As Darwin summarized: "Thus, the diagram illustrates the steps by which the small differences distinguishing varieties are increased into the larger differences distinguishing species."
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Source Own work by uploader, based on File:On the Origin of Species diagram.PNG.
Author Illustration by Charles Darwin, SVG file by Inductiveload
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5 February 2009

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current02:03, 5 February 2009Thumbnail for version as of 02:03, 5 February 2009750 × 500 (152 KB)Inductiveload{{Information |Description={{en|1=The only illustration in Charles Darwin's 1859 ''On the Origin of Species'', showing the divergence of species.}} |Source=Own work by uploader, based on [[:en:Charle
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