Circumscription of the south American moonwort botrychium (ophioglossaceae)

• Autores: Meza Torres, Esteban I.; Stensvold, M. C.; Farrar, D. R.; Ferrucci, María Silvia
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Plant Biosystems-An International Journal Dealing with all Aspects of Plant Biology, 2017, vol. 151, no. 2, p. 258-268.
• Materia: Allozymes; Botrychium; Enzyme electrophoresis; Fern spores; Moonwort; Taxonomy
• Institución: Universidad Nacional del Nordeste

Fil: Meza Torres, Esteban I. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Botánica del Nordeste; Argentina.
Fil: Stensvold, M. C. United States Department of Agriculture, Forest Service, Alaska Region; Estados Unidos.
Fil: Stensvold, M. C. Iowa State University. Department of Ecology, Evolution and Organismal Biology; Estados Unidos.
Fil: Farrar, D.R. Iowa State University. Department of Ecology, Evolution and Organismal Biology; Estados Unidos.
Fil: Ferrucci, María Silvia. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; Argentina.
Fil: Ferrucci, María Silvia. Consejo Nacional de Investigaciones Científicas y Técnica. Instituto de Botánica del Nordeste; Argentina.
The genus Botrychium (Ophioglossaceae) is comprised of about 30 widely distributed species. Because of their small size and few, yet variable, morphological characters, many questionable taxa have been described over the years. Since its description in 1906, B. dusenii has been treated as both a distinct species and variously divided into four taxa: B. lunaria var. dusenii, B. lunaria var. typicum, B. lunaria var. antarctica, and B. ramosum var. patagonicum (B. matricariaefolium subsp. patagonicum). The aim of this study is to evaluate the validity of these taxa using spore wall sculpture, spore size, allelic composition employing enzyme electrophoresis, and morphological characters. We conclude that only one species of Botrychium occurs in southern South America and recognize this as B. dusenii, a species distinct from B. lunaria. Spore size and results of enzyme electrophoresis suggest that B. dusenii is an allotetraploid derived through hybridization between a diploid member of the B. lunaria complex and a diploid member of the B. campestre complex. We provide information about habitat, distribution, and full exsiccate citations.