Galathilion (Sindarin for 'tree-moon white') was a tree grown by Yavanna from a seed from Telperion, but unlike Telperion it did not give off any light.
It stood in the open courtyard beneath the Tower of Ingwë in Tirion.
From it came Celeborn of Tol Eressëa and from that came its ancestors Nimloth of Numenor and the White Tree of Gondor.
Names
Galathilion had many other names including the White Tree, the Tree of Silver, the Tree of the High Elves, the Tree of Túna, and the Tree of Tirion.