The imperfect fungi which are decomposers of litter and help in mineral cycling belong to:

Deuteromycetes: There is only asexual and vegetative phase known so these are commonly regarded as imperfect fungi. By the establishment of linkages, the perfect stage (or sexual form) discovered in these fungi, they are moved out of Deuteromycetes to ascomycetes and basidiomycetes. The Deuteromycetes reproduces only by asexual spores known as conidia. The mycelium is septate and branched in these fungi. Some of them are saprophytes or parasites while many of them are decomposers of litter (organic matter) and help in mineral cycling.