8 



Leaf simple, faushaix'cl, with a short slender petiole. The 

 petiole is striated longitudinally and up to 1-5 mm. wide at base 

 of the leaf. The leaf reaches a length up to 3 cm. from petiole to 

 outer margin, and the margins make obtuse angles with the jjetiole. 



The veins are numerous, radially disposed and repeatedly 

 dichotomous ; in the lower part of the leaf they are about 1 mm. 

 apart, and there are about 12 in 5 mm. at the margin. 



This is a distinct form of leaf and no difficulty can be experi- 

 enced in recognising examples of the sjiecies. 



Renault' figured a si^ecimen from Xew South Wales, but gave 

 no further detail as to localitj-. 



LocaUty : — {Ipsivich Series) : Denmark Hill, Ipswich (Fill), 



Figured specimen : The original of Plate 1, fig. 1, is six^cimen 

 F 111 in the collection of the Queensland Geological Survey. 



Ginkgo digit ata (Brongniart). 



(Plate 1, figs. 3, 4, 5.) 



For full synonymy, see Seward (00), p. 254. 



1900. Ginkgo digitaia, Seward, Jurassic Flora, vol. 1, p. 254. 



The specimen figured on Plate 1, fig. 4, is very similar to 

 specimens figured from time to time as Ginkgo Huttoni (Sternberg). 

 In 1900 Seward* included this species as a synonym of G. digitaia 

 (Brongniart), on account of the marked variation in leaf -form of 

 the recent species G. biloba. This great variation must be remem- 

 bered in dealing with the fossils, otherwi.se the tendency will be 

 to unduly increase the number of species of Ginkgo, and thus 

 exaggerate its importance in a flora. In the same work Seward 

 suggests retaining the term Huttoni as a varietal name for the 

 more deeply-lobed examples of G. digitata. 



The specimens mostly have lanceolate segments, varying in 

 length from about 3-5 cm. to 8 cm. on the one leaf, the outer ones 

 lieing the shorter and the central ones longer ; they are about 8 mm. 

 wide at the widest part and there are as many as 10 segments in a 

 leaf. The veins are dichotomovis, usually dividing twice, and there 

 are about 10 veins at the widest part of a segment. 



The specimen figured by Shirley as Ginkgo sp.^ may be an ex- 

 ample of G. digitata in which the leaf is not deeply divided, similar 

 to that figured by Seward from the Inferior Oolite of Yorkshire.* 



Renault (85), t. 2, flg. 19. " Shirley (98a), t. 5. 



Seward (00), p. 254. ' Seward (00a), t. 2, flg. 5 



