Global Carex Group (http://systematics.mortonarb.org/cariceae/about)

Dr. Takuji Hoshino (Hoshino Lab., Okayama University of Science/ The Japanese Society of Cyperology)

Herbarium of Okayama University of Science (OKAY)

Dr. Hiroshi Ikeda (Botany, Univerisity Museum, the University of Tokyo/ TI Herbarium)

Dr. Yu Ito (Setsunan University)

Dr. Akira Yamawo (Hirosaki University)

Dr. Kohtaroh Shutoh (Hokkaido University)