Rafflesia is a higher order flowering plat. It does use a
specialized "root-like" haustoria to draw nutriants from the plant is
parisatizes. These r not true roots. The plant is a parasite. similar
to Mistletoe which also uses Haustoria to feed off it's host. It is
not a fungus and it is incorrect to call its haustoria 'mycelium'.
Good luck with your project.