Fungi lacking crosswalls in the mycelium belong to
The fungus that lacks cross walls in mycelium is Phycomycetes because it grows like a single cell. The class Phycomycetes has been abolished and in its place, Zygomycetes, Chytridiomycetes, Plasmodiophoromycetes, Hyphochytridioycetes, Trichomycetes, and Oomycetes are now used. So, the correct answer is option A.