Summary
Late-formed metaphloem sieve-elements in the vascular bundles of the leaf and pedicels of Zea differ from the typical sieve elements by having thicker cell walls and larger, elongate plastids. The plastids contain a quasi-crystalline structure which is different from that observed in the spherical plastids of sieve elements of other monocotyledons.
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Walsh, M.A. Late-formed metaphloem sieve-elements in Zea mays L.. Planta 121, 17–25 (1974). https://doi.org/10.1007/BF00384002
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DOI: https://doi.org/10.1007/BF00384002