This little fern is native in northern Indiana, but it is not very conservative. It tends to show up in degraded sites, often on sandy acid soil and steep, north-facing slopes. It also can be found in high quality sites. The stipe and rachis are black or purple, and each pinna bears a small auricle near its base. Asplenium platyneuron is usually dark green during the growing season but tends to be pale in winter.