This paper presents a study of the pollen grains of Neoregelia laevis (Mez) L.B. Sm., Nidularium angustibracteatum Leme, N. billbergioides (Schult. f.) L.B. Sm., N. burchellii (Baker) Mez, N. meeanum Leme, Wand. & Mollo, N. procerum Lindm. and N. seidelii L.B. Sm. & Reitz, to contribute for evaluating their taxonomic position within the subfamily Bromelioideae. The pollen grains were acetolyzed, measured, described and photographed under light microscope, and scanning electron microscope. The pollen grains are 2(3)porate, semitectate, reticulate, rarely foveolate. Based on analysis of the morphology and measurements of pollen grains we verified a strict relationship among Neoregelia laevis and Nidularium burchellii, N. billbergioides and N. seidelii (subgenus Canistropsis), and among Nidularium procerum with Nidularium meeanum and N. angustibracteatum (subgenus Nidularium). Nidularium billbergioides, with its duplicolumellate walls differs from all others species.
Bromeliaceae; palynotaxonomy; Nidularium; Neoregelia
