comb., a climbing neuropteroid seed fern
from the Stephanian of central France.
A great deal has been said in older botanical literature about the seed ferns
, a group of plants that is now extinct.
FERNS AND SEED FERNS
. The telome theory offers one explanation for the nature of the aerial portion of the plant body of the Ophioglossaceae.
The cones led botanists to first place the species with the gymnosperms, the broad group that includes conifers, ginkgoes, and seed ferns
. However, cellular details of Welwitschia's reproduction echo processes observed within flowers.
These termites and their ancestors are thought to have been eating old dead wood for at least 400 million years, since the Devonian, when Earth's forests consisted of tree lycopods and giant seed ferns
. But neither this species nor any of the termites with more restricted diets is in fact able to digest ingested wood.
from the late Paleozoic and Mesozoic: any angiosperm ancestors lurking there?
The diversification of early arborescent seed ferns