the mistletoe which killed Baldur was ‘too Jung’; hence this clinging parasite could be interpreted as the ‘child of the tree.’ But as the tree signifies the origin in the sense of the mother,
Jung interprets the mistletoe fatal to Baldur as an incest-symbol — the ‘child of the tree’ representing the regressive libido that the incest prohibition forbids and that therefore destroys the luminous god.
, Symbols of Transformation, 1952thesis