| Answer | Crossword Clue |
|---|---|
| exogen | a plant which grows by thickening its outer layer |
| exogens | EXOGEN, a plant which grows by thickening its outer layer |
| cambium | A cellular plant tissue from which phloem, xylem, or cork grows by division, resulting (in woody plants) in secondary thickening |
| cambiums | A cellular plant tissue from which phloem, xylem, or cork grows by division, resulting (in woody plants) in secondary thickening |
| periderms | The corky outer layer of a plant stem formed in secondary thickening or as a response to injury or infection |
| periderm | The corky outer layer of a plant stem formed in secondary thickening or as a response to injury or infection |
