A fungus grows on decaying wood in a moist place, has aseptate coenocytic mycelium and produces spores inside sporangia.
The features identify Phycomycetes. Members of this class may occur on decaying wood in moist places, possess aseptate coenocytic mycelium and produce zoospores or aplanospores inside sporangia. Mucor is an example.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Phycomycetes Ascomycetes Basidiomycetes