Microgramma tuberosa

The rhizome is 2 to 3.5 millimeters (0.079 to 0.14 in) thick and shaped like a rope, branching occasionally. It bears small, firm scales appressed to the surface, densely covering it and occasionally overlapping. They are chestnut brown in color, with pale borders that are erose to denticulate. They vary considerably in form and shape, from almost round and 0.5 millimeters (0.02 in) long to ovate with a long-acuminate apex, 1.5 millimeters (0.059 in) (occasionally 2.0 millimeters (0.079 in)) long, and generally persist on the rhizome when mature. Like other members of subgenus Solanopteris, the rhizome bears hollow tubers, formed from modified branches of the rhizome. These are borne directly on the rhizome, without a stalk, are roughly globular in shape, and are covered by the same scales as the rest of the rhizome.

Its natural habitat is subtropical or tropical moist lowland forests, where it grows as an epiphyte. It is known only from a few collections in Ecuador.