Hymenophyllum is a genus of ferns which includes around 300 recognized species. Some common synonyms for the word hymenophyllum include filmy fern, lace fern, and slender fern. These descriptive names stem from the fine, delicate appearance of the fern's fronds, which are typically thin and translucent. Another synonym for hymenophyllum is cup fern, which refers to the shape of the fern's reproductive structures. Despite the many synonyms for hymenophyllum, the genus is best known for its stunning beauty and intricate detail, making it a favorite amongst gardeners and nature enthusiasts alike.