Wild mushrooms are an exotic variation of the culinary classic.  They provide a refreshingly exciting flavor and add diversity to preparation methods.  There are several ways to preserve mushrooms, including freezing, canning and drying. Canned mushrooms are easy to prepare, for they are ready for immediate use.  The drying and freezing processes beneficially alter the flavor of the mushroom, enhancing its natural aroma.  The mushrooms, when rehydrated or thawed, serve many culinary purposes.