Microscopy of a Woody Stem

Woody stems and roots produce xylem yearly. The xylem accumulates as successive layers or growth rings. Three are visible in this woody Tilia stem.

The boundary between phloem and xylem is the vascular cambium, a secondary meristem. You can see it to the left in this image. Most tissue of a large tree is secondary xylem (wood) that accumulates inside this meristem. Phloem produced by this meristem is found just under the bark of trees.

Note: To magnify this image, move your mouse to the right and let it rest on an icon for each desired magnification.

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