ESTUDIO POLÍNICO DE ALBERTINIA BRASILIENSIS SPRENG., DE LAS ESPECIES DE COLOLOBUS H. ROB., CYRTOCYMURAH. ROB. YDASYANTHINA SERRATA(LESS.) H. ROB. (VERNONIINAE-COMPOSITAE) QUE OCURREN EN EL SUDESTE DE BRASIL

Abstract

Palynotaxonomy of Albertinia brasiliensis,
Dasyanthina serrata, and species of
Cololobus and Cyrtocymura (VernoniinaeCompositae) 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.