Table 2.
Dimensions and geometry of annular and helically reinforced xylem vessels in non-woody plants
| Source of data |
Wall thickness, t (μm) |
Thickening spacing, s (μm) |
Thickening area, A (μm2) |
Estimated angle, α (degrees) |
Radius of vessel, R (μm) |
|---|---|---|---|---|---|
| Esau 1977, fig. 8.10a | 0·38 | 1·82 | 0·87 | 10–20 | 3·60 |
| Esau 1977, fig. 8.12a | 0·38 | 3·50 | 1·56 | 10–17 | 4·25 |
| Jensen and Salisbury, 1972, p.409 | 0·5 | 6·0 | 4·22 | 12–17 | 5·0 |
| Roberts, 1976, fig. 27 | 0·5 | 1·81 | 0·91 | 0–3 | 6·88 |
| SEMa investigation (Lilium) | 0·54 | 5·36 | 3·06 | 9 | 15·71 |
| SEMa investigation (Lilium) | 0·91 | 6·97 | 3·24 | 0 | 7·88 |
a
Scanning electron microscope.