Lygodium kaulfussi
Green River Formation
Parachute Creek Member
Uintah County, Wyoming

This specimen is a very well preserved and detailed leaflet. The venation is very distinct and has excellent detail.
Lygodium is a relatively abundant fern that is found in the Green River Formation of Wyoming and Utah. It is an extant genus and if represented today by about 40 living species. The genus is native to tropical regions across the world but is mostly seen in Asia. Lygodium is called a climbing fern because it has indeterminate growth and a flexible rachis that allows the frond to form climbing or trailing vines.