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.

原球茎的大部分细胞都含有淀粉粒，根状茎的皮层细胞含淀粉粒，而假鳞茎几乎不含淀粉粒。