Broomrapes (of which the Red Broomrape is the commonest in Northern Ireland) are all parasitic plants, attaching themselves to the roots of a host species, in this case, the roots of ivy.
Although ivy is a very common and widespread species, this parasite is rare, and almost confined to County Fermanagh (one recently discovered site on the Antrim Coast).
All names: Orobanche hederae Duby
NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database
iNaturalist: Species account : iNaturalist World Species Observations database