The rhizomes are thin and cord-like. At regular intervals, special short shoots branch off and grow into potato-like hollow growths, which serve as nesting sites for ants. Because of these "potatoes", Solanopteris species are also known as "potato ferns". The tubers have an opening on the underside. The structure is very reminiscent of the leaves of Dischidia major, which have been converted into nesting structures.
Solanopteris bismarckii occurs in Ecuador and Peru at medium altitudes.
The shoots are greenish and scaly, and the leaves are undivided.
The domatia of S. bismarckii have several conspicuous spiny outgrowths, giving them a morning star-like appearance.