Resumen

MENDONCA, C. B. F.; GONCALVES-ESTEVES, V.; SOUZA, M. A.  y  ESTEVES, R. L.. ESTUDIO POLÍNICO DE ALBERTINIA BRASILIENSIS SPRENG., DE LAS ESPECIES DE COLOLOBUS H. ROB., CYRTOCYMURA H. ROB. Y DASYANTHINA SERRATA (LESS.) H. ROB. (VERNONIINAE-COMPOSITAE) QUE OCURREN EN EL SUDESTE DE BRASIL. Polibotánica [online]. 2007, n.23, pp.77-92. ISSN 1405-2768.

Palynotaxonomy of Albertinia brasiliensis, Dasyanthina serrata, and species of Cololobus and Cyrtocymura (Vernoniinae- Compositae) of southeast Brazil. A pollen study of seven species belonging to four genera, Albertinia brasiliensis, Cololobus, Cyrtocymura and Dasyanthina serrata was conducted with the objectives of describing the pollen characters of these species and evaluating their taxonomic implications. The pollen grains were acetolyzed for observation and illustration with light microscopy. Further details of pollen surface and aperture were revealed through analysis of non-acetolyzed pollen grains by means of scanning electron microscopy, and subsequently, electron micrographs. A dichotomous key was constructed to separate the genera into two groups using the size of the polar area and the organization of muri in the apocolpus region. All Cyrtocymura species possessed mediumsized pollen grains and were united in the first group. The majority of the species fell into the second group. Albertinia brasiliensis and Cololobus hatschbachii were the only species with the apocolpus region having such a central lacuna; they are segregated by polar area, very small in the first species and small in C. hatschbachii. Cololobus longiangustatus, Cololobus rupestris and Dasyanthina serrata were palynologically very similar, differing only in values of the confidence interval. We concluded that isolated pollen characters are not sufficient to define three of the four genera analyzed here.

Palabras llave : Compositae; palynology; Southeast Brazil; Vernoniinae.