: The frond consists of 6 to 14 pairs of triangular, toothed leaflets. The lowest pair are often the largest, and they gradually decrease in size toward the tip.
: Its fronds are relatively small, typically ranging from 4 to 20 cm (about 1.5 to 8 inches) in length. bradley's spleenwort
This fern has a fascinating evolutionary history known as . It originated as a hybrid between the Mountain Spleenwort ( A. montanum ) and the Ebony Spleenwort ( A. platyneuron ). : The frond consists of 6 to 14
: The lower half of the stalk is a distinct shiny, reddish-brown or blackish color, while the upper half (the rachis) transitions to green. reddish-brown or blackish color
Bradley's spleenwort - Illinois Department of Natural Resources