L., Sp. Pl. 1063.1763
Small terrestrial plant, consisting of a single succulent stem bearing 1 sterile leaf (rarely 2) and 1 fertile stalk. Sterile leaf blade arising 2-9 cm above ground, ovate, acute to rounded at apex, cuneate at base, ca 1-4 cm long. Sporangia borne distally on a long, slender, solitary stalk extending 5-20 cm above sterile leaf, the sporangia sessile, thick-walled, lacking annuli. Dressler 2874.
Collected once in the Laboratory Clearing. The species has been seen fertile only during the rainy season. Mexico to Argentina; West Indies; Old World. In Panama, known only from BCI.