Fasciculated roots are modified adventitious roots that grow at the base of the stem. Because of this modification, they are often thicker and fleshier. They can be distinguished from modified tap roots by their cluster of roots that originate from a single point. As they grow, they also become thicker and fleshier due to the food they store.
Holdfast roots are a type of root that supports a plant in place. They are flat, stick-like structures that penetrate cracks and adhere to a support. The roots also have claws to hold on to the support. Climbing plants use holdfast roots to anchor themselves to rocks, walls, or trees.