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Microspore morphology of Isoetes species (Lycophyta) from Southern South America

Publication Type:Journal Article
Year of Publication:2006
Authors:C. C. MacLuf, Morbelli, M. A., Giudice, G. E.
Journal:Botanical Review
Pagination:121 - 134
Date Published:2006///

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. © 2006 The New York Botanical Garden.

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