|1. Terminal pinnules of mature fern round to ovate, mostly less than twice as long as wide.....Pellaea intermedia.||1. Terminal pinnules of mature fern more linear, mostly several times as long as wide.....2.||2. Lowest pinnae on frond have more than seven pinnules.....Pellaea truncata.||2. Lowest pinnae on fronds have less then seven pinnules.....3.||3. Habitat receives direct sunlight most of the day; apex of
terminal pinnule segments mucronate;
pinnules strongly recurved; pinnules at end of costae usually less than 2cm in length.....Pellaea wrightiana.
|3. Habitat in shade much of the day; apex of
terminal pinnule segments not mucronate; pinnules somewhat recurved;
pinnules at end of costae usually over 2cm in length.....Pellaea atropurpurea.