Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"114071 - Dryopteris expansa (C. Presl.) Fraser-Jenkins & Jermy, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-18604. Accessed 08 Jan. 2025.