-(Pollen morphology of Caesalpinia echinata Lam. (Leguminosae -Caesalpinioideae)). Pollen grains from seven collections of C. echinata were examined. The pollen material was acetolysed, measured, described, and digitally photographed by light microscopy and, microscopy scanning electron. Pollen grains of C. echinata are medium to large in size, suboblate to oblate spheroidal, circular amb, 3-brevicolporate, colpus with a wide microreticulate margin, formed by the thinning of sexine at that region, endoaperture lolongate, exine reticulate, heterobrochate.
Itapuã State Park is located in the municipality of Viamão, between the 30º 20 'and 30º 27' S and between 50º 50' and 51º 05' W, in the state of Rio Grande do Sul, southern Brazil. The Park is one of the state conservation units, maintaining remnants of the Atlantic forest, rocky fi elds vegetation, coastal forest, "vassoural," mixed grassland, moist, bathed and juncal plains. Artifi cial pollen traps were installed inside the park, between forest and human-modifi ed fi eld. The study presents a morphological description of 34 plant families, represented by 47 different pollen grains and monilophyte spores (including exotic taxa), unpublished data for the park's palinofl ora. Quantitative data revealed the presence of 77% of non-arboreal pollen grains, 20% of arboreal pollen grains, 2% of monilophyte spores and 1% of other that can be both arboreal and nonarboreal pollen grains. Non-arboreal pollen grains, especially Poaceae, dominated in all the traps, even those located in forest areas. The dominance of the human-modifi ed fi elds around collectors and winds from the northeast infl uenced the dispersion of these grains. Exotic pollen grains of the Betulaceae family, of Andean origin, also occurred in the pollen rain, resulting from dispersion by atmospheric currents of long distances.
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