244 MR. HAMSHAW THOMAS ON THE FOSSIL FLORA OF [June I913, 



of the lamina (PI. XXV, fig. 4) -was sometimes undivided for 

 a length of 7. cm. or more : at the lower eud it is^ 3 mm. broad, 

 but it widens out to 5 or 10 mm. near the place where it first 

 divides ; above this it forks four or five times, the breadth of the 

 segments being 3 to 4 mm. The veins are not well marked, even 

 in the best-preserved specimens ; but sometimes three or four slight 

 parallel ridges can be made out. The apices of the segments 

 are rounded. These specimens have hitherto been denominated 

 Baiera gracilis? but they are really quite distinct from that 

 species, being almost three times as large, having thicker segments, 



Fig. 5. — Gamer a-lucida drawings of the epidermal cells of Baiera 

 longifolia, showing the characteristic papilla and stomata on the 

 lower side. x about 200. 



[A=TJpper epidermis; E=Lower epidermis ; C = Sectional view of 

 the upper epidermis.] 



more bifurcations, and a different cuticular structure. They 

 approach most nearly to the specimens from Siberia described by 

 Heer 2 as B. longifolia (Pomel). The only point in which the 

 similarity is not close is in the basal portion, which is said to be 

 jmuch shorter in the Siberian examples ; but it is doubtful whether 

 this is a character on which great stress can be laid : they are 



1 Lane & Saunders (09) p. 82. 



2 Heer (76) p. 52 & pi. vii, figs. 2-3, pi. viii, pi. ix, figs. 1-11, pi. x, figs. 6-7. 



