Dryopteris filix-mas (MalefFern) Contains contain aspidin and filicic acid. Used for treating tapeworm infestation and made famous when Louis XVI paid Madame Nouffer 1800 francs for her secret recipe - powdered root and lime blossom water, followed by caster oil. Cushions and mattresses have been stuffed with the fronds as prevention against rheumatism. As in N0021582C. ARTISTIC. Close-up of leaf.