What is the most ancient species of plant that yet exists in our planet?

Question

(Not the most ancient plant alive, but the one species wich exists since several ages 'till today)

Answer 1

The fern family--such as the tree fern

Answer 2

I agree with Chas_cha but if you go for the evolution thing see the site below.

Answer 3

All plants were created at the same time, on day 3.

There is no such thing as 'ancient' species of plants.

Evolutionists used to tell us that grass had not evolved in the time of the dinosaurs - until grass was found in their coprolites.

Answer 4

Phylogeny of green terrestrial plants- Embryophytes

http://tolweb.org/Green_plants/2382

http://tolweb.org/Embryophytes/20582

As plants are defined today the Bryophytes (liverworts, hornworts, and mosses) with no specialized water conducting cells are the eldest terrestrial species dating back to the Silurian period 400 mya.

http://www.palaeos.com/Plants/default.ht...

http://www.palaeos.com/Paleozoic/Siluria...

http://www.emc.maricopa.edu/faculty/fara...

Then came the vascular plants in the Devonian period when the first ferns (Pteridophytes) like Psilotum (whisk fern) separated first.  Modern whisk ferns include two genera, Psilotum and Tmesipteris.

http://www.ucmp.berkeley.edu/devonian/de...

http://books.google.com/books?id=wwJsn0b...

The club mosses are recent relatives of the first Lycopods (trees up to 50 m tall 370-280 m.a. ago) that grew in swamps. Horsetails remain from this period's sphenophytes.

http://www.devoniantimes.org/who/pages/f...

The gymnosperms first appeared with the ginko and the cycads in the late Devonian period. The cycads came about 250 million years ago and lasted for some 35 million years. They both still exist as a few species.