Nature and distribution of the exine-held material in mature pollen grains ofapium nodifloruml (apiaceae)

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Abstract
In Apium nodiflorum two kinds of exine-held material are observed: pollenkitt and residuals of the polysaccharidc primexine matrix. The latter is forming a loose texture inbetween the tectum elements, while pollenkitt exists in spaces between bacules as well as the outer exine surface. Furthermore the existance of an exinic outer membrane is discussed.