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. Fenestraria: Fenestraria (known as babies' toes or window plant) is a (possibly monotypic) genus of succulent plants in the family Aizoaceae, native to the Namaqualand in Namibia.
yes