T A X O N O M Y
Bisaccate Grains
This picture shows a podocarpus pollen grain (left) and a grain from a pine tree (right).
Coniferous trees such as pine, podocarpus and spruce produce a pollen grain consisting of a single central body with two attached bladders. Pollination of coniferous trees is dependent on the spreading of the grains by wind. The bladders enable the pollen grains to travel over long distances in the air. Bisaccate grains are present in the fossil record beginning from the Devonian.
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