XL] 



BAIERA 



49 



In a former account of this species 1 1 included the specimen repro- 

 duced in fig. 661 (p. 66), also a similar specimen figured by Phillips 2 

 as a distinct type,, Baiera micro- 

 phylla. The examination of addi- 

 tional material collected from the 

 Yorkshire coast by Mr Hamshaw 

 Thomas leads me to substitute 

 Czekanowskia for Baiera as the 

 more appropriate name for the 

 bunch of leaves represented in fig. 

 661 which is in all probability 

 identical with B. microphylla as 

 figured by Phillips. In the case of 

 incomplete leaves it is by no means 

 easy to* distinguish B. Lindleyana 

 from Czekanowskia microphylla ; but 

 in the latter the branches of the 

 lamina are separated by a smaller 

 angle and if cuticular preparations 

 are available the stomata afford a 

 means of differentiation : in Baiera 

 the guard-cells are surrounded by 

 a circular group of cells, while in 

 Czekanowskia the subsidiary cells 

 are longer and narrower, forming a more oblong group. 



Baiera Lindleyana is recorded also from Middle Jurassic rocks 

 in Chinese 3 Dzungaria and from Upper Jurassic rocks in Scotland 4 , 

 Some specimens described by Fontaine 5 from the Black Hills 

 (Lower Cretaceous) as Czekanowskia nervosa Heer are, as Berry 6 

 points out, probably leaves of a Baiera, and I am disposed to refer 

 them to B. Lindleyana. 

 Baiera Brauniana (Bunker). 



This species 7 , represented by leaves from Wealden and Upper 

 urassic rocks, agrees in the form and dissection of the lamina 



1 Seward (00) B. p. 266, fig. 46 (p. 268). 



I 2 Phillips (75) A. p. 200, fig. 9. 3 Seward (11) PI. iv. fig. 44. 



4 Seward (II 2 ) PI. v. fig. 105. 

 5 Fontaine in Ward (99) B. p. 685, PI. 169, figs. 1, 2. 

 6 Berry (11) p. 374. ' Dunker (46) A. p. 11, PL v. fig. 4. 



s. iv 4 



FIG. 653. Baiera Lindleyana. 

 (British Museum; A, 39208; B, 

 V. 3682.) 







