"every improvement in the circumstances of the society tends... to raise the real rent of land" - Adam Smith

that is always the way the ownership of land is a fundamentally antiproductive pursuit and the landlord essentially raises a tax upon industry and production of any kind. By picking those mushrooms he provides value from the labor of identification of safe mushrooms and their picking. As is their way the landowner is against the production of any value because they're not only parasitic but useless