PH (the botanical herbarium of the Academy of Natural Sciences) is the oldest institutional herbarium in the United States. It is a national resource for material from 1750-1850. The diatom herbarium (ANSP) is managed separately.

GBIF url: https://www.gbif.org/dataset/38bdc3d6-9748-4f72-9d5f-55ffd573b5d1
Citation: Academy of Natural Sciences (2026). Academy of Natural Sciences of Drexel University - Lichens. Occurrence dataset https://doi.org/10.15468/5n94ch accessed via GBIF.org on 2026-08-07.