(Greek, lip-flower, alluding to the in dusium). Polypodidcew. Semi-hardy or hothouse ferns of small size, often hairy or woolly, with the sori ten'nl- nal on the veins and covered with a roundish indusium. Some 60 or 70 species are known, nearly a third of which are natives of the west and southwest, one species as far east as Connecticut. They are of easy culture, enjoying a position near the glass, and disliking strong, close heat and syringing or watering overhead.