Microspore morphology ofIsoetes species (lycophyta) from southern South America |
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Authors: | C Cecilia Macluf Marta A Morbelli Gabriela E Giudice |
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Institution: | (1) Palinología and Morfología Vegetal, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Basque s/n (1900), La Plata, Argentina;(2) Palinología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n (1900), La Plata, Argentina;(3) Morfología Vegetal, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n (1900), La Plata, Argentina |
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Abstract: | Microspores of the 24 species ofIsoetes that grow in southern South America were analyzed under a light microscope and scanning electron microscope. The microspores are monolete, elliptic in polar view, 30–40 μm long, and 20–25 μm wide. A background with various characteristics is seen on each surface. A supra-laesural expansion is present. The perispore is ornamented and has a perforated background. In section, it has a lacunose structure. The exospore is smooth, and it has a compact structure in section. The studied species could be divided into three groups by their perispore ornamentation: equinate, rugulate, and tuberculate. Microspore size was positively correlated with increasing ploidy level, and larger microspores were associated with terrestrial habitats. A convergence in ornamentation was found between spores produced by the studied species and those that grow in regions outside of the area under study. |
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