Thonningia sanguinea Vahl.was observed to develop tyloses internally, as a result of intrusion of the host Hevea brasiliensis into its tissue. The tissues were also squeezed and xylem cells split off into strands. At the point of contact between T. sanguinea. And the host plant, enlarged tissues (galls) developed. Ecologically, the plant is
hazardous to rubber as it dominates the plantation floor.
