1. Paired images in DIC optics (light background) and polarised light (black background) of starch grains from the latex of Euphorbia species. The simplest (left) are round, but with growth become serrated at the periphery. Euphorbia latex contains many elongated, bone-shaped starch grains, which can develop new centres of deposition of starch and branch, then fill in the indentations with further deposition.

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