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There are a large number of starch grains in most cells of protocorm and in cells of cortex parenchyma of rhizome, but almost no starch grain is found in pseudobulb. 原球莖的大部分細胞都含有澱粉粒，根狀莖的皮層細胞含澱粉粒，而假鱗莖幾乎不含澱粉粒。