2.3 Vascular tissues and cell types
There are two vascular tissues in the vascular tissue system: xylem for water transport and phloem for transport of photosynthates.
2.3.1 Xylem
The xylem is a complex tissue containing a range of cell types including: vessel cells, tracheids, fibers, parenchyma
2.3.1.1 Vessel members
![Figure 2.8. Large xylem vessel cells with thick red-stained lignified cell walls.](https://cduebooks.pressbooks.pub/app/uploads/sites/9/2018/08/9-Xylem-vessel-cells-SMB.jpg)
Figure 2.9. Xylem vessel cells with annular lignification in Coleus (left), annular (centre) and reticulate lignification in corn (right).
2.3.1.2 Tracheids
![Figure 2.10.b. Tracheids in tangential section in Quercus](https://cduebooks.pressbooks.pub/app/uploads/sites/9/2018/08/11a-Tracheids-in-Quercus-BCC.jpg)
2.3.2 Phloem
2.3.2.1 Sieve cells and companion cells
![Figure 2.11. Phloem tissue in LS including sieve cells and companion cells](https://cduebooks.pressbooks.pub/app/uploads/sites/9/2018/08/12-Phloem-sieve-tubes-Cucurbita-BCC.jpg)
![Figure 2.12. Diagram shows location of a narrow companion cell alongside a sieve cell and the sieve plate connecting two of the sieve cells](https://cduebooks.pressbooks.pub/app/uploads/sites/9/2018/08/12b-Phloem-sieve-tubes-Cucurbita-diag-SMB.jpg)
2.3.3 Procambium cell development
![Figure 2.13. Development of a procambium cell into various vascular tissue cell types.](https://cduebooks.pressbooks.pub/app/uploads/sites/9/2018/08/13-Development-of-procambium-cell-SMB-png.gif)
Media Attributions
- Figure 2.8. Large xylem vessel cells © Sean Bellairs is licensed under a CC BY-SA (Attribution ShareAlike) license
- Figure 2.9.b. Xylem vessel cells © Sean Bellairs is licensed under a CC BY-SA (Attribution ShareAlike) license
- Figure 2.9.a. Annular xylem vessels © Berkshire Community College Bioscience Image Library is licensed under a Public Domain license
- Figure 2.9.c. Zea mays stem © BlueRidgeKitties is licensed under a CC BY-NC-SA (Attribution NonCommercial ShareAlike) license
- Figure 2.10.a. Tracheids in tangential section in Quercus © Berkshire Community College Bioscience Image Library is licensed under a Public Domain license
- Figure 2.10.b. Tracheids in tangential section in Quercus © Berkshire Community College Bioscience Image Library is licensed under a Public Domain license
- Figure 2.11. Phloem tissue in LS including sieve cells and companion cells © Berkshire Community College Bioscience Image Library is licensed under a Public Domain license
- Figure 2.12. Diagram shows location of a narrow companion cell alongside a sieve cell and the sieve plate connecting two of the sieve cells © Sean Bellairs is licensed under a CC BY-SA (Attribution ShareAlike) license
- Figure 2.13. Development of a procambium cell into various vascular tissue cell types © Sean Bellairs is licensed under a CC BY-SA (Attribution ShareAlike) license