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Transverse sections of A. africana. (a) The anatomical structure of callus, (b,c) initiation of shoot apical meristem, (d) shoot apical meristem and leaf primordial, (e–g) transverse section of young leaf, and (h) transverse section of young stem. apm, apical meristem; ep, epidermis; vb, vascular bundle; mr, midrib; pa, palisade parenchyma; sp, sponge parenchyma; st, stomata; lp, leaf primordial; ls, leaf sheath; lsc, leaf sheath canal; pi, pith; axm, axillary meristem.
