This delicate book cover is from The National Media Museum's website. It is the front page of a 1843 photography book on ferns by Anna Atkins.
Wikipedia informs me that there are over 12,000 species of fern. They are the world's most ancient plants having been found as fossils in 400 million year old rocks. Coal is largely made up of fossilised ferns and finally, some ferns are edible (although I'm not sure which ferns are the ones you can eat or where you can find them!).
All images from here.