菌褶又称为蕈褶，指担子菌类伞菌的构造中，子实体（担子果）的菌盖内侧具有皱褶的部分，或由菌褶原发育成的结构。从横切面看，每个菌褶的两侧有子实层。在内侧紧靠子实层的子实下层，其内侧有一圈子实层基。再内侧，即从菌褶中心形成菌盖的部分，称为菌髓。纵剖子实体时所见之菌褶与子实体柄的关系，是伞菌类真菌分类的重要特征。

A lamella, or gill, is a papery hymenophore rib under the cap of some mushroom species, most often but not always agarics. The gills are used by the mushrooms as a means of spore dispersal, and are important for species identification. The attachment of the gills to the stem is classified based on the shape of the gills when viewed from the side, while color, crowding and the shape of individual gills can also be important features. Additionally, gills can have distinctive microscopic or macroscopic features. For instance, Lactarius species typically seep latex from their gills.