Seed ferns
This fossilized leaf is from Glossopteris, a seed fern that thrived during the Permian age (290–240 million years ago).
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Evolution of Seed Plants. October 17, 2013."
http://cnx.org/content/m44653/latest/Figure_26_01_02.jpg
OpenStax CNX
CC BY 3.0.
