XL] 



BAIERA 



45 



type-specimen of the latter species the segments are fewer than 

 in B. Muensteriana, but in some Jurassic forms (e.g. fig. 651) 

 this difference no longer holds good. This is only one among 

 several instances where Rhaetic and Jurassic 'species' cannot be 

 separated by any constant differentiating feature. B. Muenste- 

 riana is recorded also from Persia 1 and several European localities, 

 but it is impossible to determine its geographical range apart from 

 that of Baiera gracilis. 



Baiera gracilis Bunbury ex Bean MS. 



The type-specimen of this species from the Middle Jurassic 

 rocks of Yorkshire, as shown in fig. 649, is an impression of an 



FIG. 649. Baiera gracilis. Type- 

 specimen of Bunbury (Bun- 

 bury Collection, Botany 

 School, Cambridge). 



FIG. 650. Baiera gracilis. (British Museum, 39208.) 



imperfect leaf with a fan-shaped lamina deeply divided into forked 

 linear segments 2 : a better example is reproduced in fig. 650. Bean 



1 Schenk (87) B. PL vm. fig. 44; Zeiller (05) p. 194. 



2 Bunbury (51) A. p. 182, PL xn. fig. 3. 



