72 



DESMIOPHYLLUM 



[CH. 



due to the section having passed slightly below the level of the 

 epidermal surface. The cells of the epidermis are short and have 

 straight walls. 



Though we should not be justified in asserting that the leaves 

 named Desmiophyllum Solmsi are examples of Phoenicopsis, the 

 probability is that they belong to that genus. Phoenicopsis is 



B 



FIG. 662. Desmiophyllum Solmsi. A, transverse sections of leaves ; B. tangentia 

 section of the lamina showing veins and mesophyll; C, stomata. (From 

 sections in the Museum of the Geological Survey. London.) 



especially characteristic of Jurassic rocks and is best represented 

 in the Middle Jurassic series of Siberia. The genus is recorded also 

 from Spitzbergen 1 , Franz Josef Land, and Bornholm 2 : a species, 

 P. Gunni 3 , has been described from Upper Jurassic rocks in Scot- 

 land, the only example of the genus in Britain. Feistmantel 4 



1 Nathorst (97), p. 16. 2 Moller (03) p. 30. 



3 Seward (II 2 ) p. 681, PL ix. fig. 35 4 Feistmantel (77) fig. 9 



