Phyllocnistis liriodendronella is a moth of the Gracillariidae family, known from the United States (New York, New Jersey, Maryland, Pennsylvania, Kentucky). The hostplants for the species include Liriodendron tulipifera, Magnolia glauca, Magnolia grandiflora, and Magnolia virginiana. They mine the leaves of their host plant. The mine has the form of a long, winding, linear mine on either surface of the leaf, especially the small terminal leaves.