The Francis J. Trembley Herbarium is housed in the earth and environmental science department at Lehigh University, and is actively used for teaching and research. The collection is focused on vascular plants and bryophytes from Pennsylvania and adjacent States, but also includes collections from elsewhere in North America. The collection includes Francis Trembley's collections in the Lehigh Valley and elsewhere during the 1930s. As of September 2013, specimen data is still currently being checked for errors. Additional specimens will also be added in the coming months. Georeferencing for collections in the Northeast will also being in the next few months.