40McNamara, Tom. "The Green Cloak." Personal interview. 21 June 1999.
According to C. Austin, writing in The Celtic Connection, "The concept of a divine World Tree or Tree of Life, the mythic bridge between the worlds of god and human, is entwined with the veneration of trees. As an embodiment of the universe, the roots of the World tree inhabit the underground, the deep knowledge of earth. The trunk unites the roots with the upper celestial canopy. The products given by each tree were considered a physical manifestation of divine providence." (Austin, C. "The Wisdom of Trees in the Celtic Landscape." The Celtic Connection. Web. 15 May 2012. <http://merganser.math.gvsu.edu/myth/trees.html>.)
According to Michael Dames, "The stone...may have served as a solid reminder to those in the real world that the phantom tree beneath the lough, the ideal tree, was also substantial, and would be seen again." (Dames, Michael. Mythic Ireland. London: Thames and Hudson, 1992. 78.)