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Microphotographs of in situ charred grass epidermis showing phytolith shape morphology variation in Brachypodium pinnatum (A, B) and Brachypodium sylvaticum (C, D). Phytolith with digitized landmarks (E): two fixed landmarks (red points) and 98 equidistant semi landmarks (49 points along both halves of the phytolith) (blue curves).
