Rumohra adiantiformis var. laciniata (Dryopteridaceae), a New Variety Endemic to Southeastern Uruguay

Rumohra adiantiformis var. laciniata is reported as a new variety endemic to the Sierras del Este Eco Region, Southern Uruguay. The new variety inhabits Sierras de Maldonado landscape, growing in shady places of moist hillside forests. It differs from Rumohra adiantiformis var. adiantiformis by the shape and size of the pinnules, lamina, and rachis with a dense and conspicuous indument of capitate glandular hairs, yellowish, with exudate, and by the margins of the rhizome scales with capitate glands. Another two interesting features of this new variety are the furcate or laciniate (cresting) apex of the rachis as well as the pinnae and pinnules, and the faint light-bluish iridescence of the lamina adaxially. These two last features are related to the habitat of these plants that grow in shady places. In this paper, we present a description, illustrations, a distribution map, and discussions about this new taxon as well as a key to identifying the species occurring in Argentina, Southern Brazil, and Uruguay.