K.  Suetsugu, Tsukaya, H., Nurainas, N., and Okada, H., ?Thismia sumatrana (Thismiaceae), a new species from West Sumatra, Indonesia, with discussions on the taxonomic identity of Thismia clavigera?, PhytoKeys, vol. 113, pp. 59 - 67, 2018.

K.  Suetsugu and Sugimoto, T., ?First Record of the mycoheterotrophic plant Sciaphila corniculata (Triuridaceae) from Ishigaki Island, Ryukyu Islands, Japan, with updated description of its morphology, in particular on stylar characteristics?, Acta Phytotax. Geobot., vol. 69(1), pp. 69 - 74, 2018.

K.  Suetsugu, ?Sciaphila lambirensis (Triuridaceae), a new mycoheterotrophic plant from Sarawak, Borneo, Malaysia?, Acta Phytotax. Geobot., vol. 69(3), pp. 175 - 180, 2018.

K.  Suetsugu, ?Achlorophyllous orchid can utilize fungi not only for nutritional demands but also pollinator attraction?, Ecology, vol. 99(6), pp. 1498 - 1500, 2018.

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, Tsukaya, H., Tagane, S., Chhang, P., Yukawa, T., and Yahara, T., ?Flora of Bokor National Park VII: Thismia bokorensis (Burmanniaceae), a new species representing a new generic record?, Phytotaxa, vol. 334(1), pp. 65-69, 2018.

T.  Nishioka, Suetsugu, K., Repin, R., and Kitayama, K., ?Thismia kinabaluensis (Thismiaceae), a new species from Mt. Kinabalu, Sabah, Borneo?, Phytotaxa, vol. 360(2), pp. 174 - 178, 2018.

K.  Suetsugu, Nakanishi, O., Kobayashi, T., and Kurosaki, N., ?Thismia kobensis (Burmanniaceae), a new and presumably extinct species from Hyogo Prefecture, Japan?, Phytotaxa, vol. 369(2), pp. 121 - 125, 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.

M.  Cheek, Tsukaya, H., Rudall, P. J., and Suetsugu, K., ?Taxonomic monograph of Oxygyne (Thismiaceae), rare achlorophyllous mycoheterotrophs with strongly disjunct distribution?, PeerJ, vol. 6, p. DOI 10.7717/peerj.4828, 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.