Pollen flora of Pakistan-LXXII. Ericaceae

Pollen morphology of three genera representing 5 species of the family ericaceae from pakistan has been examined by light and scanning electron microscope. pollen grains usually tetrads,radially symmetrical,isopolar,mostly prolatespheroidal,olate-spheroidal rarely spheroidal,trizonocolporate,sexine thicker or thinner than nexine. tectal surface mostly rugulate with viscin threads or aerolate-scabrate or subpsilate-reticulate. on the basis of size and tectum types 3 distinct pollen types are recognized,viz.,cassiope fastigiata-type and rhododendron lepidotum-type and rhododendron hypenanthum-type.