(Pollen morphology of the tribe Canarieae (Burseraceae) in South America). The tribe Canarieae is represented in South America by two genera, Dacryodes Valh and Trattinnickia Willd. Pollen grains from 27 collections representing 12 taxa were examined. The pollen material was acetolyzed, measured, described and photographed by light microscopy and, in most cases, also by electron microscopy scanning. The data obtained was statistically analysed by methods according to sample sizes. Dacryodes and Trattinnickia have the same intermediate size as well as form (mostly subprolate) of pollen grains. The light microscopic picture of the sexine of Dacryodes shows a psilate surface, while in Trattinnickia this is granulate; nevertheless, electron microscopic scanning examination reveals that in both taxa the surface is perforate-psilate. In the case of Dacryodes the size of pollen grains as well as the size of the apertures enable separation of D. glabra (Steyerm.) Cuatrec., D. nitens Cuatrec. and D. occidentale Cuatrec., while the other species are indistinguishable. In Trattinnickia the only characteristic that differentiated T. burserifolia Mart. from the other taxa studied was the aperture, it being brevicolpate in this species.
Burseraceae; Dacryodes; Trattinnickia; pollen grains
