In fact you can still find plants that date from the Devonian – Psilotum nudum.    From Wordnik.com.  [Unthreaded #15 « Climate Audit] Reference

Patches of dry deciduous forests, especially along the Tirupathi Hill Ranges, are known for a large number of medicinal plants and various other species of botanical interest, among which are the rare endemic cycad (Cycas beddomei) and Psilotum nudum.    From Wordnik.com.  [Deccan thorn scrub forests] Reference

The genome shows a high degree of synteny with that of Adiantum, but differs considerably from two basal ferns (Angiopteris evecta and Psilotum nudum).    From Wordnik.com.  [BioMed Central - Latest articles] Reference