The specialized roots of parasites.

Rootlike outgrowths of a parasitic plant that attach to and obtain food from a host plant. (singular: HAUSTORIUM)

Branches of parasitic plants or fungi which enter the tissues or cells of the host.

Peg-shaped projections of the Mycobiont (fungal element of a lichen), inserted into the algal cell to feed on the cell's sugars.

Specialized structure of a fungus or mistletoe that enables it to enter a host cell.