(i) Ascolichen : If the lichen forming fungus belongs to the class of Ascomycetes then it is called ascolichen. E.g. Rhizocarpon macrosporum.
(ii) Basidiolichen : If the lichen forming fungus belongs to the class Basidiomycetes then it is called Basidiolichen. For example – Clavaria mucida.
(iii) Deuterolichen : If the lichen-forming fungi belong to the class of Deuteromycetes, they are called deuterolichens. Such as Racodium rupestre, Leparia incana etc.