THE JURASSIC FLORA OF SUTHERLAND. 



679 



A. B 



Text-Fig. 8.—? Bichopteris sp. 



A. Natural size. 



B. Leaflet enlarged, showing venation. (Peach collection, 52,659e. 



II. GYMNOSPERM.E. 



A. GINKGOALES. 



The only two specimens found in the collections from the north of Brora referable 

 to this group of Gymnosperms are the leaves shown in text-fig. 9, A and B. The 

 genus Ginkgo is recorded by Miss Stopes from the older beds south of Brora.* 



Text- Fig. 9. 



A. Ginkgo sibirica, Heer (nat. size). (Arber collection, 553.) 



B. Baiera Brauniana (Dunker) (nat. size), showing the veins in an enlarged piece of one of the linear segments. 



(Gunn collection.) 



The considerable range in the degree of subdivision of the lamina of the leaves of 

 the recent Ginkgo biloba and the numerous forms of Baiera and Ginkgo from Mesozoic 

 strata render satisfactory specific diagnosis impossible. 



Ginkgo, Kaempfer. 



Ginkgo sibirica Heer. (Text-fig. 9, A.) 



1876. Ginkgo sibirica, Heer, Flor. Foss. Aret., vol. iv., 2, p. 61, pis. vii., ix., etc. 



The imperfect leaf represented in fig. 9, A, collected at Gartymore by Mr Arber, is 



characterised by a lamina deeply dissected into blunt segments with about eight veins in a 



breadth of 8 mm. It resembles numerous leaves of Jurassic age referred to different 



species of Ginkgo and Baiera. and is similar to B. multipartita Schimp., which was first 



* Stopes (07). 



