| Since the midvein is at the center of the images it is clearly shown that the leaves curl toward their adaxial surface. |
| Sori numerous, rather near the midvein, stipe and rachis lustrous brown. |
| There is no midvein, and veins are longitudinally parallel. |
| Generally each leaf, or microphyll, is narrow and has an unbranched midvein, in contrast to the leaves of the ferns and seed plants, which generally have branched venation. |
| Its leaves are dull green with toothed margins and a raised midvein on the underside. |
| Each toothlike leaf has a single, unbranched midvein. |
