Licence: Public Domain Mark
Credit: Branches of scots pine (Pinus sylvestris). Pen drawing. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0043569/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Branches of scots pine (Pinus sylvestris). Pen drawing. Wellcome Collection. Source: Wellcome Collection.