Polypodium vulgare
From LSJ
Τὰ μηδὲν ὠφελοῦντα μὴ πόνει μάτην → Ne tu labores frustra in iis, quae nil iuvant → Müh nicht umsonst mit dem, was dir nichts nützt, dich ab
Wikipedia EN
Polypodium vulgare, the common polypody, is an evergreen fern of the family Polypodiaceae. The name is derived from poly (many) and pous, podos (a foot). Polypody has traditional uses in cooking for its aroma and sweet taste, and in herbal medicine as a purgative and vermifuge.