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Desmophlebiaceae and Desmophlebium: A new family and genus of Eupolypod II ferns

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Based on an analysis of five plastid markers (atpA, atpB, rbcL, rps4-trnS, trnL/trnL-trnF), we show that Diplazium lechleri is sister to a clade formed by the Hemidictyaceae and Aspleniaceae. Thus, it does not belong to the Athyriaceae where previously classified. A new family, Desmophlebiaceae, and a new genus, Desmophlebium, are described to accommodate this relationship. Morphologically, Desmophlebium is distinguished from Diplazium by the combination of thick 1-pinnate laminae, entire pinnae, decurrent distal pinnae, conform lamina apices (i.e., the terminal segment is similar to the lateral pinnae), and the presence of a submarginal connecting vein. On the basis of morphology, we also assign Diplazium longisorum to the new family and genus. Accordingly, the new combinations Desmophlebium lechleri and D. longisorum are provided. A lectotype is designated for Diplazium parallelogrammum, a synonym of Desmophlebium lechleri. Desmophlebium grows in humid forests from 125 to 1900 m. Desmophlebium lechleri occurs from Panama to north-central and northeastern Brazil, and D. longisorum occurs in Colombia, Ecuador, and Peru.
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Keywords: ATHYRIACEAE; ATHYRIOID FERNS; DIPLAZIUM; MOLECULAR SYSTEMATICS; TAXONOMY

Document Type: Research Article

Affiliations: 1: Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, Pacheco Leão 915, 22460-030, Rio de Janeiro, RJ, Brazil;, Email: [email protected] 2: Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, México Distrito Federal 04510, Mexico, The New York Botanical Garden, 2900 Southern Blvd., Bronx, New York 10458-5126, U.S.A. 3: The New York Botanical Garden, 2900 Southern Blvd., Bronx, New York 10458-5126, U.S.A. 4: Universidade Federal do Rio de Janeiro, Instituto de Biologia, Departamento de Botânica, Av. Carlos Chagas Filho 373, 21941-902, Rio de Janeiro, RJ, Brazil 5: Muséum national d'Histoire naturelle, Sorbonne Universités – Institut de Systématique, Evolution Biodiversité UMR 7205 CNRS, MNHN, UPMC, EPHE – Herbier national, 16 rue Buffon CP39, 75005 Paris, France

Publication date: 08 March 2016

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