M.  Yamato, Takahashi, H., Shimono, A., and Kusakabe, R., ?Distribution of Petrosavia sakuraii (Petrosaviaceae), a rare mycoheterotrophic plant, may be determined by the abundance of its mycobionts?, Mycorrhiza, 2016.

M.  Yamato, Ogura-Tsujita, Y., Takahashi, H., and Yukawa, T., ?Significant difference in mycorrhizal specificifty between an autotrophic and its sister mycoheterotrophic plant species of Petrosaviacea?, J. Plant Res., vol. 127, pp. 685 - 693, 2014.

M.  Yamato, Yagame, T., Shimomura, N., Iwase, K., Takahashi, H., Ogura-Tsujita, Y., and Yukawa, T., ?Specific arbuscular mycorrhizal fungi associated with non-photosynthetic Petrosavia sakuraii (Petrosaviaceae)?, Mycorrhiza, vol. online first, 2011.

H.  Tobe and Takahashi, H., ?Embryology of Petrosavia (Petrosaviaceae, Petrosaviales): evidence for the distinctiness of the family from other monocots?, J. Plant Res., vol. 122, pp. 597 - 610, 2009.

H.  Takahashi, ?Pollen morphology and systematic in two subfamilies of the Ericaceae, Pyroloideae and Monotropoideae?, Korean J. Pl. Taxon., vol. 18, pp. 9 - 18, 1988.

H.  Takahashi, ?Pollen morphology and its taxonomic significance of the Monotropoideae (Ericaceae)?, Bot. Mag. (Tokyo), vol. 100, pp. 385 - 405, 1987.

H.  Takahashi, Nishio, E., and Hayashi, H., ?Pollination biology of the saprophytic species Petrosavia sakuraii (Makino) van Steenis in central Japan?, J. Plant Res., vol. 106, pp. 213 - 217, 1993.