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Plant remains. (A) Fiber of flax (LM). (B) Fiber of flax (SEM). (C) Starch grain (Lugol staining, LM). (D) The same starch grain at polarizing LM. (E and F) Starch grain at LM and polarizing LM. (G and H) Pollen grain of Olea europaea (LM: optical cross-section and exine surface focus). (I) Group of pollen grains (LM).
