Sporopollenin was isolated from pollen of Lilium /ongiflorum , Ambrosia trifida and A . artemisiifolia. The sporopollenin was characterized with re spect to its infrared spectrum , elemental composition and nature of potassium hydrox ide fu sion products. Sporopollenin from the Ambrosia species seemed identical. There were only slight differences between Lilium and Ambrosia sporopollenin.
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