10 



BAIERA. 



The generic name Baiera is here used for leaves similar in 

 general form to those of Ginkgo, but deeply divided into long, 

 narrow, linear segments. 



Baiera Simmondsi (Shirley). 

 (Plate 2.) 



1886. Jcanpaulia pahnata, Ratte. P.L.S.N.S.W., 1, p. 1078. 



1887. Salisburia palmata, llatte, P.L.S.X.S.W., 2, p. 137, t. 17. 

 1898. Ginkgo Simmondsi, Shirley, Qld. Geol. Surv., Bull. 7, p. 12. 



t. 2. 



Leaf large, divided into numerous segments which are separate 

 to the base. There are up to 9 segments near the petiole, and 

 these divide dichotomously once, twice, or occasionally a third 

 time, producing a large number of ultimate segments, which are 

 about 5 mm. broad. The segments are long and narrow and 

 gradually broaden awa}- from the petiole ; they reach a total length 

 up to 15 cm. from the top of the petiole. The veins are fine and 

 numerous and divide dichotomously ; they average about 3 veins 

 per mm. of breadth. The petiole is comparatively^ slender for 

 the size of the leaf, being about 4 mm. broad at the top and narrowing 

 shghtly away from the leaf ; none of the specimens show its full 

 length, but in the most complete it is 6 cm. long. 



The species is quite common at Denmark Hill, Ipswich. It has 

 been suggested both by Arber^'- and Seward^^ that it is identical 

 with Baiera multifida, Fontaine.^* It differs, however, from Fontaine's 

 figures of that species a good deal in general appearaiice ; in addition, 

 the segments are not so strap-shaped as in B. muUifidu. It seems 

 to me that B. multifida resembles more closely B. ipsviciensis from 

 the Queensland strata than it does B. Simmondsi. 



There is no doubt that the present species should be referred 

 to Bciera rather than to Ginkgo. Arber^** has pointed out that 

 Ratte's name palmata had already been adopted by Heer for a fossil 

 of this genus from the Jurassic of Siberia. 



Localities : — {Ipswich Scries) : Denmark Hill (F lOib) ; Queens- 

 port ■! (F568) ; {Walloon Scries) : Coal Ck., near Esk (F 101). 



Figured specimen : The original of Plate 2 is specimen S 1 

 in the Simmonds Collection. 



" Arber (02), p. 4. '* Fontaine (83), p. 87, t. 45, flg. 3 ; t. 46, figs. 1-3 ; t. 47, flgs. 1, 2. 



" .Seward ma), p. 17i>. *' Arbor (02), p. 4. 



