<a href="https://en.wikipedia.org/wiki/Asplenium_platyneuron" class="extiw" title="w:Asplenium platyneuron">Ebony Spleenwort</a> (<i>Asplenium platyneuron</i>)
Britton, N.L., and A. Brown.
1913
USDA PLANTS database - <a rel="nofollow" class="external free" href="https://plants.usda.gov/java/profile?symbol=ASPL&amp;photoID=aspl_001_avd.tif">http://plants.usda.gov/java/profile?symbol=ASPL&amp;photoID=aspl_001_avd.tif</a>; original source: Britton, N.L., and A. Brown. 1913. <i>Illustrated flora of the northern states and Canada</i>. Vol. 1: 27.