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Starch grains are are a means for plants to store energy. They are produced by a wide variety of plants and are a mixture
of alpha-amylose and amylopectin. Starch grain differ in their size, their shape, and the structure of the center vacuole.
Many of these differences are useful for the identification of the plant of origin for the starch grain.
Significance in the Environment:
Potato starch grains tend to be potato-like in shape. They are large, typically from 20 to 60 micrometers in longest
dimension. The center vacuole also tends to be round to ovaloid in shape and is often relatively large compared to those
in other starches.
Martin, E.A., Dictionary of Life Sciences, 2nd ed., Pica Press