Featured in the Irish poem The Voyage of Bran and the narrative Cormac's Adventure in the Land of Promise, it represents entry into the Celtic Otherworld or Tír na nÓg.
After singing verses describing her land as the place of delight (with poetic names such as the "Plain of White Silver"); thereafter she slipped away, and the branch sprang back to her, with Bran having no power to keep it in his grasp.
[8][9] Eleanor Hull wrote a paper drawing parallel between this silver branch and the golden bough of Roman legend which was required for entry into the Underworld (Pluto).
[10] In like manner, the branch (silver or otherwise) is an object given to a human invited by a denizen of the Otherworld to visit his/her realm, offering "a clue binding the desired one to enter".
[12] Though not a genuine Celticist, to quote W. H. Evans-Wentz, "the silver branch of the sacred apple-tree bearing blossoms.. borne by the Fairy Woman is a passport to Tír n-aill (the Celtic Otherworld)".