Which of the following pairs of a fungus and its characteristic feature or common name is incorrectly matched?

Step-by-step solution

Agaricus belongs to the class Basidiomycetes and is commonly known as mushroom, whereas Ustilago is known as smut fungus. Therefore, this pair is incorrectly matched. Albugo (Phycomycetes) is indeed a parasitic fungus on mustard. Neurospora (Ascomycetes) is used extensively in biochemical and genetic work. Trichoderma belongs to Deuteromycetes, which are commonly known as imperfect fungi because only their asexual or vegetative phases are known. Answer: Agaricus - Smut fungus