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Summary

A method is described for studying simultaneously the intact and the sectional view of pollen walls. Scanning electron micrographs of such fractured pollen grains of Tilia platypliyllos Scop., T. cordata Mill, and the putative hybrid T.×vulgaris Hayne assist in the interpretation of a number of observations made by light microscopy on the differences between these taxa and confirm and amplify our interpretation of T. platyphyllos made from early transmission electron microscopy of embedded and sectioned grains. The new information makes imperative the distinction between two types of exine reticulation, one bacula-bordered and the other baculacentric (the Tilia type).