Walking Fern in Washington Co., Maryland (4/9/2017). Photo by Jim Brighton. (MBP list)

Walking Fern in Washington Co., Maryland (3/11/2013). Photo by Jim Brighton. (MBP list)

Walking Fern in Washington Co., Maryland (4/15/2018). Photo by Bill Hubick. (MBP list)

Walking Fern in Allegany Co., Maryland (4/19/2015). Photo by Jim Brighton. (MBP list)

A Walking Fern in Garrett Co., Maryland (5/21/2013). Photo by Kerry Wixted. (MBP list)

Sori distribution on the back of a fertile Walking Fern blade in Washington Co., Maryland (8/4/2012). Photo by Jim Brighton. (MBP list)

Walking Fern in Washington Co., Maryland (4/20/2014). Photo by Bill Hubick. (MBP list)

Walking Fern in Howard Co., Maryland (3/3/2016). Photo by Richard Orr. (MBP list)

Walking Fern in Howard Co., Maryland (3/1/2016). Photo by Joanne Solem. (MBP list)

Walking Fern (measured leaf) in Howard Co., Maryland (3/1/2016). Photo by Joanne Solem. (MBP list)

Walking Fern growing in Frederick Co., Maryland (3/11/2018). Photo by Robert Ferraro. (MBP list)

Walking Fern in Howard Co., Maryland (3/1/2016). Photo by Joanne Solem. (MBP list)

Walking Fern in Frederick Co., Maryland (3/11/2018). Photo by Robert Ferraro. (MBP list)

Walking Fern in Baltimore Co., Maryland (5/18/2014). Photo by Dwight Johnson. (MBP list)

Walking Fern in Howard Co., Maryland (3/3/2016). Photo by Bonnie Ott. (MBP list)

Walking Fern in Montgomery Co., Maryland (5/23/2014). Photo by Jim Wilkinson. (MBP list)

Walking Fern in Washington Co., Maryland (4/25/2016). Photo by Jim Stasz. (MBP list)

Walking Fern in Washington Co., Maryland (4/8/2017). Photo by Bill Hubick. (MBP list)

Walking Fern in Howard Co., Maryland (9/19/1976). With very limited habitat in the county, this species is very rare in Howard County. Photo by Robert Solem. (MBP list)