GINKGO. 261 



AiiArostrolus, but where there is so good a reason, as in this 

 instance, for believing the flowers to belong to a definite plant, it 

 is hardly necessary or advisable to introduce a separate designation. 

 The imperfect specimen from Franz Josef Land figured by 

 ^athorst' as a male flower of Ginkgo, is hardly distinct enough 

 for determination. 



39,320. Text-flg. 45. 



ITumerous isolated pollen - sacs, about 5 mm. long, showing 

 a median line indicating the longitudinal dehiscence. Fragments 

 •of the slender axis of the male flower are associated with the loose 

 pollen-sacs. 



This specimen is labelled by Bean " unknown leaves " (so 

 -called by Phillips in the description of his fig. 23, pi. vii.^) ; and 

 by Nathorst, "male flowers of Ginkgo digitata." 



2. Ginkgo whitbiensis, ]!^athorst. 



[Ofvers. k. Veten. Akad. Forliand. p. 74, 1880.] 



(PI. IX. Fig. 8.) 



1880. Ginkgo whitbiensis, Nathorst, Beratt. p. 74. 



1892. Ginkgo whitbiensis, Fox-Strangways, Tab. Foss. p. 138. 



Type-specimen. British ITuseum (No. 39,331). 



Leaves smaller than in Ginkgo digitata ; lamina deltoid in shape, 

 ■deeply dissected into linear segments with acuminate or somewhat 

 truncated tips. 



The small form of leaf for which IS'athorst suggested the name 

 Ginkgo wliithiensis may be conveniently regarded as distinct from 

 G. digitata, from which it differs in the smaller size of the lamina 

 iind in the somewhat more pointed segments. Some of the small 

 Ginkgo leaves, recently described by N"athorst and by Newton & 

 Teall, from Franz Josef Land,^ may be compared with this type. 



39,331. PL IX. Fig. 8. 



A leaf considerably smaller than the typical G. digitata, with 

 tapered segments traversed by prominent forked veins. A second 



1 Nathorst (00), pi. i. fig. 49. 



2 Phillips (75). 



3 Xathorst (00) ; Newton & Teall (97). 



