Which genus contains more species, Dennstaedtia or Delairea?
Dennstaedtia:  Hayscented fern, or Cup ferns, are common names for some species in this genus. Dennstaedtia:  Its best-known member is probably the temperate North-American hay-scented fern, "Dennstaedtia punctilobula" (pictured in the taxobox), which forms extensive clonal ground-cover colonies on level surfaces in the Appalachian area.
i don't know