Wis. Stat. § 844.15: Plaintiffs.

(1) If the injury or interference is only to a particular interest, the action may be brought by the owner of that interest without joining other interest-owners as plaintiffs.

(2) A person claiming injury or interference who does not have possession, may bring an action under this chapter only by alleging that the person with the right to possession refuses to bring the action, and by alleging the efforts which have been made to induce the person with the right to possession to bring the action. The person with right to possession shall be joined as a defendant. This subsection does not apply to actions for waste only.