Resumen

MONTES, B  y  MURRAY, MG. Pollen morphology of Senecio bergii (Asteraceae), with special attention to the mesoaperture. Phyton (B. Aires) [online]. 2015, vol.84, n.1, pp.201-208. ISSN 1851-5657.

Palynological studies contribute to understanding the taxonomy, phylogeny and ecology of the Asteraceae and other families. In this study, pollen morphology and ultrastructure of the exine of Senecio bergii Hieron. were studied using light, scanning and transmission electron microscopy. The pollen of this species is prolate-spheroidal, it has a Senecioid pattern on the exine and an apertural system composed of three apertures (ecto-, meso- and endoapertures). This pollen type is defined as tricolpororate due to the triple apertural system. This is the first description of the ultra-structure of the apertural system of the pollen of Argentine species of Senecio. The presence of mesoapertures and the description of the ultrastructure of the pollen of Senecio bergii contribute to the general knowledge of the Senecio pollen type, as well as to the taxonomic delimitation of species in this genus.

Palabras clave : Senecio; Pollen; Exine; Mesoaperture; Ultrastructure.

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