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Stages of stomatal development in cell files in growing stems of Ephedra (LM). (A, B) E. gerardiana. (C, E, F) E. equisetina. (D) E. likiangensis. Scale bars = 20 μm. GC, guard cell; GMC, guard mother cell; LSC, lateral subsidiary cell (with characteristic oblique walls); M, meristemoid.
