If the grain of different owners has been stored in a warehouse or elevator and has become mingled in a common mass, and any part thereof has been converted or is detained wrongfully by any person, the owner of any part of such common mass may maintain an action against the wrongdoer for the recovery of the possession or the value, as the case may be, of the quantity of such person’s contribution to such common mass. It shall not be necessary to join as a party any other person who likewise may have contributed, or be alleged to have contributed, to such common mass, but the commencement of such action shall be deemed to be a selection or segregation of such person’s interest, in all things the same as though, upon a demand made therefor, such grain or the value thereof had been set aside and delivered to such party.