The fertile fronds of Asplenium platyneuron are longer
and more erect than the sterile fronds, but are otherwise similar.
If both sterile and fertile fronds are not present, or if the
difference between fertile and sterile fronds is not recognized,
this species may be recognized by other features. The blades are
once pinnate with a basal
auricle that often overlaps the rachis. Sori are clearly elongate
and are not borne on the margins of the segments.
Asplenium platyneuron ranges from Kansas and Texas to
Florida and Maine, but extends only into southwestern Wisconsin,
north to Columbia and Lacrosse Counties, except for one report
from Door County. The plants often grow on soil, as opposed to
species that most often grow on rocks. Habitat is not specific,
but it appears to favor disturbed forests.