Yes, CALYCES is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, L 1, Y 4, C 3, E 1, S 1.

Is it a valid word?

CALYCES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green