K.  Suetsugu, Suleiman, M., Anthony, F., and Tsukaya, H., ?Aphyllorchis maliauensis (Orchidaceae), a new species from the Maliau Basin, Sabah, Borneo?, Phytotaxa, vol. 367(1), pp. 85 - 90, 2018.

K.  Suetsugu and Fukunaga, H., ?A new variety of the mycoheterotrophic plant Lecanorchis triloba (Orchidaceae) from Okinawa Island, Ryukyu Islands, Japan?, Acta Phytotax. Geobot., vol. 69(1), pp. 63 - 67, 2018.

K.  Suetsugu, Fukunaga, H., and Sawa, S., ?Epitypification of Gastrodia pubilabiata (Gastrodieae, Epidendroideae, Orchidaceae)?, Phytotaxa, vol. 347(2), pp. 193 - 196, 2018.

K.  Suetsugu, Souladeth, P., Tagane, S., and Yahara, T., ?First Record of the mycoheterotrophic orchid Lecanorchis taiwaniana from Nam Ha National Protected Area, Northern Laos?, Acta Phytotax. Geobot., vol. 69(2), pp. 139 - 141, 2018.

K.  Suetsugu, ?Seed dispersal in the mycoheterotrophic orchid Yoania japonica: Further evidence for endozoochory by camel crickets?, Plant Biol., vol. 20(4), pp. 707 - 712, 2018.

K.  Suetsugu, Suleiman, M., and Tsukaya, H., ?A new species of Gastrodia (Gastrodieae, Epidendroideae, Orchidaceae) from the Maliau Basin Conservation Area, Sabah, Borneo?, Phytotaxa, vol. 367(1), pp. 78 - 84, 2018.

K.  Suetsugu, Yiing, L. C., Naiki, A., Tagane, S., Takeuchi, Y., Toyama, H., and Yahara, T., ?Lecanorchis sarawakensis (Orchidaceae, Vanilloideae), a new mycoheterotrophic species freom Sarawak, Borneo?, Phytotaxa, vol. 338(1), pp. 135 - 139, 2018.