| The obstruction of granite rocks, cannot force the rootlet upward, nor drive the leaflet down. |
| But how is material conveyed from rootlet to veinlet of leaf hundreds of feet away? |
| It sent downward a rootlet to get soil and water, and upward it shot a stem to which the first pair of leaves was attached. |
| The rootlet then drills into the branch and spreads its developing roots under the bark and into the living tissue. |
| Upon germination, broomrape seeds develop a small radicle that grows chemotropically towards host roots and firmly connects to a host rootlet. |
| Each lobule has a branch of the pulmonary artery entering it, and a similar rootlet of the pulmonary vein leaving it. |
