Ginkgo-like plants from Yorkshire
The living tree Ginkgo biloba is considered to be a living fossil. The fossil Ginkgo-leaves from the coast of Yorkshire show indeed a striking resemblance with the modern leaves (click on the photo on the right). And that is extraordinary for Ginkgo huttonii (that's the name of the fossil) which lived 150 million years ago. Proving that the species has not changed through the millions of years is impossible because Ginkgo huttonii x Ginkgo biloba can not be realized. It is remarkable that only one male catkin of G. huttonii has been found. Seeds have been collected a bit more frequently.
In one place, near Scarborough, there must have been a Ginkgo forest , because fossil leaves are very abundant. Unfortunately we discovered some years ago that the site had been completely robbed. The following year one could buy the leaves for a lot of money on the exchanges ...
The wood of the Ginkgo-tree is hardly distinguishable from conifer
wood. The fertilization takes place with free swimming spermatozoids, which
is a primitive property.
On the left is a photograph of a stoma in the cuticle of a Ginkgo leaf. Around the stoma papillae are visible, which had the function to prevent excessive evaporation. Click on the photo for enlargement.
There are more species from this group occurring in Yorkshire, but we haven't found them. Some species have deeply divided leaves. They belong to the genera Baiera en Sphenobaiera.