What are coralloid roots?

Coralloid roots:

1. They are specialized roots that are present in Cycas.
2. Coralloid roots are associated with nitrogen-fixing cyanobacteria.
3. These root tissues in conjunction with blue-green algae are also helpful in producing amino acids such as asparagine and citrulline.
4. It grows in bunches near the stem's base and protrudes out over the ground.
5. It has a greenish-brown color and is dichotomously branched.
6. In the cortex of the root, there is an algal zone.