"The most abundant fossil fern pollen in Hell Creek belong to the royal fern family (Osmundaceae). The modern cinnamon fern (Osmundastrum) is a very close relative of this species. Like Osmundastrum, these large herbs grow colonially in swampy environments."
― Saurian encylopedia
Osmundaceae is known as the royal fern family, which includes some modern-day species, like the cinnamon fern (Osmundastrum cinnamomeum). It seems to be a quite reliable food source for Cretaceous herbivores.