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Periphytic desmids from five lagoons of the Federal District, Brazil: II - Genera Euastrum Ehrenberg ex Ralfs, Micrasterias C. Agardh ex Ralfs, and TriplocerasBailey

ABSTRACT

This study aimed at doing a taxonomic survey on the genera Euastrum, Micrasterias, and Triploceras in five oligotrophic lagoons in the Federal District, Brazil: Lagoa Bonita, Lagoa Joaquim Medeiros, Lagoa do Cedro, Lagoa Taquara, and Lagoa dos Gansos. Samples were taken between 2006 and 2009, by squeezing macrophytes and/or scraping submerged substrates; 15 samples were analyzed and deposited at the Herbarium of the University of Brasília. They were fixed in formalin solution (4%) and analyzed under 400× and 1000× magnification. This study reported 13 taxa of Euastrum , 11 of Micrasterias , and one of Triploceras . Among them, 12 are cited for the first time in the Federal District (nine Euastrumand three Micrasterias ). Lagoa dos Gansos had the highest number of taxa (14). Euastrum brasiliense var. brasiliense Borge was the most common taxon.

Keywords:
algae; Brasília; Cerrado; periphyton; Zygnemaphyceae

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