Are  Davallia and Fenestraria both names of plants?
Davallia: "D. polypodiaceae", "D. canariensis", "D. fejeensis" and "D. trichomanoides" are all grown as ornamental plants. "D. fejeensis" is the most common "Davallia" species in commerce, and "D. canariensis" is widely grown as a house plant.
i don't know