K.  Suetsugu, Nakama, M., Watanabe, T., Watanabe, H., and Yokota, M., ?The northernmost locality of Gastrodia shimizuana (Orchidaceae)?, J. Jap. Bot., vol. 87(1), pp. 67 - 69, 2012.

K.  Suetsugu, Tsukaya, H., and Ohashi, H., ?Sciaphila yakushimensis (Triuridaceae), a new mycoheterotrophic plant from Yakushima Island, Japan?, J. Jap. Bot., vol. 91, pp. 1 - 6, 2016.

K.  Suetsugu, ?New locality of the mycoheterotrophic orchid Gastrodia fontinalis from Kuroshima Island, Kagoshima Prefecture, Japan?, J. Jap. Bot., vol. 91(6), pp. 358 - 361, 2016.

K.  Suetsugu, ?A new color variant of the mycoheterotrophic orchid Cyrtosia septentrionalis from Hiroshima Prefecture, Japan?, J. Jap. Bot., vol. 91, pp. 250 - 253, 2016.