Y.  Ogura-Tsujita, Gebauer, G., Hashimoto, T., Umata, H., and Yukawa, T., ?Evidence for novel and specialized mycorrhizal parasitism: the orchid Gastrodia confusa gains carbon from saprotrophic Mycena?, Proc. Roy. Soc. London, Ser. B, Biol. Sci., vol. 277, pp. 1333 - 1336, 2009.