| 31. | Tumor cells are crowded in a distinct layer beneath the vaginal epithelium ( cambium layer ).
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| 32. | The larvae initially excavate cavities in the phloem and cambium and later galleries into the wood.
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| 33. | However, repeated fires over many centuries may penetrate the bark and destroy the vascular cambium.
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| 34. | Using their cambium layer of a branch and reach the xylem where the sap is located.
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| 35. | In roots, the cork cambium originates in the pericycle, a component of the vascular cylinder.
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| 36. | Rays are horizontal rows of long-living parenchyma cells that arise out of the vascular cambium.
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| 37. | Inside the phloem is a layer of undifferentiated cells one cell thick called the vascular cambium layer.
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| 38. | :: The only part of the tree trunk that is living or growing is the cambium.
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| 39. | They excavate a shallow cavity that penetrates the inner bark to the cambium surface of the wood.
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| 40. | They bore into the cambium of the trunk, branches, and twigs of their host plant.
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