In mangrove vegetation plants possess
(2) stilt root
(4) haustorial roots
(3) In mangrove plants i.e. plants growing in saline marshes, the branches of tap root grow vertically upwards showing negative geotropism. These roots are called pneumatophores which have minute pores on their exposed portion called pneumathodes to take O2 e.g., Rhizophora, Avicennia.