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Regarding Aarne-Thompson type: Isn't this a combination of tales? Get me for original research, but:

403C: The Witch Secretly Substitutes her own Daughter for the bride. (see AT 403) The husband throws the witch's daughter under the bridge. From the girl's navel grows a reed in which the witch recognizes her own daughter

Not sure what the last part is though; there are various near-matches with the burning the skin motif, nothing I can find based on false brides:

D721.3. Disenchantment by destroying skin (covering). 425G: False Bride Takes Heroine's Place as she tries to stay awake 432*: Bird Lover Disenchanted 441: Hans my Hedgehog

85.210.10.50 23:32, 4 October 2007 (UTC) (Tom)