White domecap: Cap is typically smooth and slightly convex.
False champignon: Cap tends to be more flat or even slightly depressed in the center.
White domecap: Typically grows in dense clusters with stems often fused at the base.
False champignon: Usually found singly or in small groups, but not densely clustered.
White domecap: Typically has little to no distinctive smell.
False champignon: Often emits a fragrant, sweetish odor.