Anales del Jardín Botánico de Madrid, Vol 65, No 2 (2008)

Morphological and taxonomical studies in Blechnum (Blechnaceae-Pteridophyta): B. tabulare and B. magellanicum


https://doi.org/10.3989/ajbm.2008.v65.i2.291

Cristina H. Rolleri
Laboratorio de Estudios de Anatomía Vegetal Evolutiva y Sistemática (LEAVES), Facultad de Ciencias Naturales y Museo de La Plata , Argentina

Carmen Prada
Departamento de Biología Vegetal I, Facultad de Ciencias Biológicas, Universidad Complutense , Spain

Lilian Passarelli
Laboratorio de Estudios de Anatomía Vegetal Evolutiva y Sistemática (LEAVES), Facultad de Ciencias Naturales y Museo de La Plata , Argentina

Abstract


Specimens of B. tabulare and B. magellanicum from their whole geographical area were studied, and taxa were treated as different species. The following characters were analyzed: rhizomes, rhizomatic scales, stipes, division of dimorphic laminae, outline, texture, size, margins, indument, venation, epidermal patterns, stomata (size and density), mesophyll of pinnae in transversal section, mucilaginiferous unicellular glands of axes and laminae, and spores. Habit of plants, type of rhizome, rhizomatic scales, mucilage glands, and type of ornamentation of the perispore are characters shared by the two species, while the other traits vary at the specific level, allowing them to be identified as two separate taxa. Blechnum tabulare is distributed in the tropics and subtropics of South America, África, and Islands of the Atlantic and Indic Oceans, while B. magellanicum is a subantarctic, more restricted species, that grows in humid areas of Argentina and Chile, South America. New descriptions of both species are given, along with comments on their affinities with other arborescent species of the genus.

Keywords


Blechnaceae; Blechnum tabulare; Blechnum magellanicum; taxonomy; sporophyte; spores; geographical distribution

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