Estudos botânicos nas Ilhas de Maiandeua/Algodoal (Pa), Morfologia polínica da vegetação da restinga de Algodoal - Pa. Família Myrtaceae

Abstract

The islands of Algodoal and Maiandeua located in the municipality of Maracanã, Pará, Brazil have a characteristic mangrove and restinga vegetation with diverse plant communities, with great potential for palynological studies. Restingas are coastal ecosystems, physically determined by edaphic conditions and by marine influence, of recent sedimentary origin, and the species that live there have mechanisms to withstand the dominant physical factors. In this ecosystem is the Myrtaceae family, which is considered stenopolynic, Salgado-Iabouriau (1973), that is, it presents little variation in the types of pollen grains. The objective of this work is to study the morphology of pollen grains of the species Calycolpus goetheanus (DC.) Berg., Eugenia biflora (L) DC., E. jlavescens DC, E. patrisii Vahl, E. punicifolia (H. B. K) DC., E. tapacumensis Berg, Myrcia cuprea (Berg) Kiaerskou, M. fallax (Richard) DC., M. multiflora (Lamarck) DC.,M.rufipita MC. Vaugh,M. speciosa (AmshofO MC. Vaugh,M syloatica (G. Meyer) DC. and Myrciaria tenel/a.(DC) Berg. Adult floral buds were taken from the herbaria MG (Museu Paraense Emílio Goeldi) and IAN (EMBRAPA, Amazônia Oriental). Erdtman's acetolysis method was used for slide preparation. Subsequently, pollen grains were analyzed for size, shape and number of openings and stratification of the exine. The grains were micrographed under light microscope and scanning electron microscope. Pollen grains were observed to be small, isopolar, of radial symmetry, oblate shape, triangular ambulate 3-( 4)-colporate, syncolporate and parasincolporate with a granular surface. These results agree with the description given by Salgado-Iaboríau (1973) about the family. A pollen key was made in order to separate the species.