| 11. | A few leaf types also have a vascular cambium.
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| 12. | Cambium and other actively dividing tissues also synthesize cytokinins.
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| 13. | Cambium and procambium are their main centres of production.
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| 14. | They are formed by the activity of fascicular cambium.
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| 15. | The cambium is clear and the cortex is a clear-brown color.
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| 16. | They mine the cambium of their host plant, creating slender elliptical mines.
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| 17. | They bore in the cambium of their host plant.
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| 18. | Bark is continually replaced by a living layer of cells called the cork cambium.
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| 19. | Cankers also may continue to expand and penetrate into the cambium of the tree.
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| 20. | They petiole and mining in the cambium layer.
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