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Scanning electron microscopy coupled with energy dispersive spectrometric analysis reveals for the first time weddellite and sylvite crystals on the surface of involucral bracts and petals of two Xeranthemum L. (Compositae) species

AuthorsGavrilović, Milan; Erić, Suzana; Marin, Petar D.; Garcia-Jacas, Núria ; Janaćković, Pedja; Susanna de la Serna, Alfonso
Weddellite and sylvite crystals
Involucral bracts and petals
Issue Date26-May-2017
PublisherMicroscopy Society of America
Cambridge University Press
CitationMicroscopy and Microanalysis 23(3): 679-686 (2017)
AbstractIn this work, weddellite and sylvite crystals are identified for the first time on the involucral bracts and petals of Xeranthemum annuum and Xeranthemum cylindraceum using scanning electron microscopy coupled with energy dispersive spectrometric (SEM-EDS) analysis. Well-developed crystals of weddellite (CaC2O4·2H2O) occur in the form of a tetragonal bipyramid (hhl), rarely in combination of a bipyramid and tetragonal prism (h00). Indumentum of involucral bracts of X. cylindraceum consists of nonglandular and glandular trichomes. Sylvite (KCl) crystals are observed only on the petal surface of X. cylindraceum. The crystals of sylvite occur in the form of perfect cubes (hexahedrons), but some crystals are deformed, i.e., partially elongated. Taxonomic significance of investigated microcharacters as well as the use of SEM-EDS analysis in taxonomic studies of plants are discussed.
Description8 p., ilustraciones, gráficos
Publisher version (URL)http://dx.doi.org/10.1017/S1431927617000551
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