K.  Suetsugu, Kaida, S., Fukunaga, H., and Sawa, S., ?A new form of the mycoheterotrophic plant Lecanorchis japonica?, Acta Phytotax. Geobot., vol. 71(3), pp. 243 - 248, 2020.

B. V.  Truong, Hsu, T. C., Bui, V. H., Tu, B. N., Dang, V. S., Luu, H. T., and Suetsugu, K., ?The genus Lecanorchis Blume (Orchidaceae) in the flora of Vietnam?, Taiwania, vol. 65(1), pp. 86 - 94, 2020.

K.  Suetsugu, Nishioka, T., and Hogaki, Y., ?Rediscovery of Oxygyne hyodoi (Thismiaceae) in its type locality after 30 years (in Japanese)?, J. Phytogeogr. Taxon., vol. 68, pp. 89 - 91, 2020.

E. A.  Shepeleva, Schelkunov, M. I., Hrones, M., Sochor, M., Dancak, M., Merckx, V. S. F. T., Kikuchi, I. A. B. S., Chantanaorrapint, S., Suetsugu, K., Tsukaya, H., Mar, S. S., Luu, H. T., Li, H. - Q., Logacheva, M. D., and Nuraliev, M. S., ?Phylogenetics of the mycoheterotrophic genus Thismia (Thismiaceae: Dioscoreales) with a focus on the Old World taxa: delineation of novel natural groups and insights into the evolution of morphological traits?, Bot. J. Linn. Soc., vol. 193, pp. 287 - 315, 2020.

K.  Suetsugu, Dancak, M., Hrones, M., Naiki, A., Tagane, S., and Yahara, T., ?Resurrection and emended description of Sciaphila major (Triuridaceae)?, Phytotaxa, vol. 459(1), pp. 25 - 38, 2020.

K.  Suetsugu and Kinoshita, A., ?Sciaphila kozushimensis (Triuridaceae), a new mycoheterotrophic plant from Kozu Island, Izu Islands, Japan, based on morphological and molecular data?, Phytotaxa, vol. 436(2), pp. 157 - 166, 2020.

L. H.  Truong, Hsu, T. C., Bui, V. H., Tu, B. N., Dang, V. S., Luu, H. T., and Suetsugu, K., ?The genus Lecanorchis Blume (Orchidaceae) in the flora of Vietnam?, Taiwania, vol. 65(1), pp. 86 - 94, 2020.

K.  Suetsugu, Matsubayashi, J., and Tayasu, I., ?Some mycoheterotrophic orchids depend on carbon from dead wood: novel evidence from a radiocarbon approach?, New Phytol., vol. doi: 10.1111/nph.16409, 2020.