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Light micrographs of transverse sections of Cercidiphyllum japonicum after the Mäule reaction. Phloem fibres from the tension side (A, C) showed a more pronounced reddish-purple colour than those from the opposite side due to the presence of more syringyl units in lignin (B, D). (C) The rectangular area in (A) at higher magnification; (D) the rectangular area in (B) at higher magnification.
