Asplenium platyneuron

right: a not typical looking ebony spleenwort
(note the circinate vernation)

below: a fairly typical looking ebony spleenwort

The spleenworts are known to hybridize freely, making field identification difficult.  In this case, the stipe and lower part of the rachis were black, suggesting ebony spleenwort

but it’s impossible to know for sure.

At any rate I wanted to post this because the plant looks neat and I love the pictures.  Also to get the earworm “ebony spleenwort” out of my head.  Note that I got the phrase “circinate vernation” out, too.