Sources:
http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=280706
http://www.ecoenchantments.co.uk/myogham_oakpage1.html
https://historydaily.org/tree-gods-worshiping-mighty-oak-trees
https://www.icysedgwick.com/oak-tree-folklore/
https://www.monumentaltrees.com/en/gbr/england/kent/960_fredvillepark/1720/
https://www.wanderlust.co.uk/content/oldest-trees-in-the-uk/
https://bavipower.com/blogs/bavipower-viking-blog/oak-tree-symbolism-in-norse-mythology
https://www.thorstrees.co.uk/blog/know-your-trees/know-your-trees-series-the-mighty-oak/
https://www.historic-uk.com/CultureUK/The-Green-Man/