Comparative anatomy and morphometric analyses of Polystichum (Dryopteridaceae) from southern South America
Background and aims: Polystichum is represented in Argentina and Chile by11 species, which originated within the Austral South American and the Andeanlineages. The taxonomy of Polystichum is controversial because of its widespreadhybridization and complex patterns of reticulation. The aims of the pr...
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| Autores principales: | , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Sociedad Argentina de Botánica
2022
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| Acceso en línea: | https://revistas.unc.edu.ar/index.php/BSAB/article/view/36825 |
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| Sumario: | Background and aims: Polystichum is represented in Argentina and Chile by11 species, which originated within the Austral South American and the Andeanlineages. The taxonomy of Polystichum is controversial because of its widespreadhybridization and complex patterns of reticulation. The aims of the present studyare: 1) to define morpho-anatomical characters that contribute to the differentiation of both lineages, 2) to improve the species delimitation.M&M: Morphological measurements and histological examinations under lightmicroscope, were made of fronds and rhizomes of nine Polystichum species(seven belong to the Austral South American Clade and two to the Andean Clade). Furthermore, 13 quantitative characters of 77 Austral South American herbarium specimens were included in two multivariate statistical procedures.Results: The main characters we found that separate the South American Australclade from the Andean species studied are: indusia, spinules of ultimate segmentsand edge of rhizomes and petioles scales. In the South American Austral clade, wefound shape and division of lamina, basal pinnae length, the number of pinnae pairsper lamina and the number of them with sori, and some anatomical features, suchas glandular hairs of indusia, circumendodermal band and petiole meristemeles number, are informative characters at the species level.Conclusions: For the first time, our study recovered anatomical and morphometricfeatures that consistently can be used to separate the nine Polystichum speciesinhabit southern South America. |
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