Not an accepted name (status: unknown). The accepted name is Carex brunnea subsp. brunnea 1784.

Carex brunnea var. abscondita T.Koyama, 1954 2% complete

No common name

J. Jap. Bot. 29: 45 (1954)

There is no corrections for Carex brunnea var. abscondita yet.