Whitridge, Henry, and Darlene Southworth. “Mycorrhizal Symbionts of the Terrestrial Orchid Cypripedium Fasciculatum”. Selbyana 26, no. 1/2 (April 1, 2020): 328–334. Accessed January 2, 2025. https://journals.flvc.org/selbyana/article/view/121447.