430 



CONIFERALES INCERTAE SEDIS 



[CH. 



in this narrower sense Elatocladus is more likely to serve the object 

 which the author had in view. It is noteworthy that in some 

 specimens of Elatocladus (Taxites spp.) the leaves have a transversely 

 wrinkled lamina, a feature usually associated with the detached 

 linear leaves assigned to the genus Pityophyllum. 



Elatocladus heterophylla Halle. 



The shoots of this species from the Jurassic flora of Graham 

 Land 1 are freely branched and the ultimate branches show a 



FIG. 801. Elatocladus heterophylla. (After Halle; nat. size.) 



tendency towards a distichous arrangement. The radially sym- 

 metrical branches bear short and thick, acute, more or less appressed 

 leaves or the lamina may be slightly falcate, while the dorsiventral 

 shoots have narrow linear acute leaves in two ranks (fig. 801). 

 A faintly marked midrib is present in both forms of leaf. Halle 

 states that the shorter leaves differ from those of Brachyphyllum 

 in being rather longer and less closely appressed to the axis, though 

 this is a difference of secondary importance. The main interest 

 of the species is its dimorphism. 



In Elatocladus is also included the Indian species, recorded by 



1 Halle (13 2 ) p. 84 ; PI. vm. text-fig. 18. 



