Proteoid Roots
The formation of dense cluster rootlets on elongating lateral roots is characteristic of Casuarina quiseti folia. Even though Azospirillum and AM fungi could be isolated from such roots, no clear cut evidence has comeforth to pinpoint that microorganisms are responsible for the formation of proteoid roots. The function of these roots may be to absorb phosphorus from the vicinity of root system more efficiently than the lateral roots.