Stone Flower / Dagad Phool — Chettinad's Rare Lichen (दगड फूल / पत्थर के फूल)

Chettinad region (Sivaganga District, Tamil Nadu) and Deccan Plateau; also used in Maharashtra

Stone flower (Parmotrema perlatum, known in Tamil as kalpaasi and in Hindi as dagad phool or pathar ke phool) is a lichen — not a seed, bark, or berry — that dries on boulders and is harvested from rocky landscapes of the Deccan Plateau. It appears in exactly two regional cuisines in India: Chettinad (Tamil Nadu) and Maharashtrian goda masala. In Chettinad, it is considered the thirteenth and defining spice of the masala, without which the cuisine is incomplete. It contributes a deeply earthy, forest-floor, slightly mossy note — an umami-adjacent quality that gives Chettinad preparations their distinctive depth. It is always dry-roasted briefly before use.

Functions as an invisible background layer in Chettinad chicken, Chettinad fish curry, and mutton preparations. Diners cannot always identify it but immediately sense its absence.