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1 April 2006 Microspore Morphology of Isoetes Species (Lycophyta) from Southern South America
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Abstract

Microspores of the 24 species of Isoetes 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.

C. Cecilia Macluf, Marta A. Morbelli, and Gabriela E. Giudice "Microspore Morphology of Isoetes Species (Lycophyta) from Southern South America," The Botanical Review 72(2), 121-134, (1 April 2006). https://doi.org/10.1663/0006-8101(2006)72[121:MMOISL]2.0.CO;2
Published: 1 April 2006
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