Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"139593 - Dryopteris expansa (C. Presl.) Fraser-Jenkins & Jermy, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-160135. Accessed 02 Feb. 2025.