Mankyuoideae

Mankyua is a recently discovered plant, a single species in its own genus. It is a fern in the Ophioglossales. Its only species, M. chejuense, grows only on Cheju Island of South Korea. While this plant is clearly ophioglossoid in the broad sense, its precise cladistic position is uncertain. It has a fused sporangial structure similar to Ophioglossum, but a vegetative structure, with palmately-radiating pinnae, reminiscent of Helminthostachys. It may be a basal offshoot of the...