Chapter: Plant Anatomy:An Applied Approach: The structure of xylem and phloem

Gymnosperm phloem

In gymnosperms, the axial phloem consists of sieve cells and parenchyma cells, some of which become albuminous cells.

Gymnosperm phloem

In gymnosperms, the axial phloem consists of sieve cells and parenchyma cells, some of which become albuminous cells (see Fig. 5.5); some gymno-sperms have fibres in the phloem as well. The homocellular rays are nor-mally uniseriate. There is often very little wall thickening but sclerification can take place. The outermost phloem layers either become compacted, or are incorporated into the ‘bark’ or rhytidome.

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Plant Anatomy:An Applied Approach: The structure of xylem and phloem : Gymnosperm phloem |