XLVl] BKACHYPHYLLUM 327 



portions of leaf-traces. The most striking feature is the occurrence 

 of reticulately .pitted, isodiametric tracheids, closely resembling 

 those in recent Araucarian leaves and in Brachyjphyllum crassum. 

 Stomata were found on some of the leaves agreeing in the possession 

 of four accessory cells (fig. 724, A, page 216) with those described 

 by Jeffrey! ^j^^ Thompson^ in B. crassum. Though comparable with 

 Araucarian leaves in the structure and distribution of the trans- 

 fusion-tissue and in the branching leaf-traces, there is hardly 

 sufficient evidence to warrant any positive statement with regard 

 to the relationship to recent genera of the American and Scottish 

 species. 



Brachyphyllum vulgare (Stopes and Fujii). 



In their account of Uppgr Cretaceous plants from Hokkaido, 

 Japan, Drs Stopes and Fujii* instituted a new genus Yezonia for 

 some petrified shoots which they suggested should be placed in a 

 special family of Gymnosperms. The specimens of fohage-shoots 

 they described as Yezonia vulgaris and for a cone, which they con- 

 sider may belong to the vegetative branches, the generic name 

 Yezostrohus was proposed. The slender foliage-shoots bear appressed ' 

 leaves, apparently spirally disposed, agreeing closely with those of 

 recent Cupressineae in their form and relation to the axis; but in 

 the absence of impressions their surface-features cannot be clearly 

 determined. Anatomically the shoots agree very closely with 

 Brachyphyllum crassum: the pith contains groups of sclerous cells; 

 the leaf- traces branch repeatedly in the base of the leaf, and trans- 

 fusion-tissue is abundant in the mesophyll. The secondary xylem 

 shows uniseriate separate pits on the tracheids, and the medullary 

 rays are 1 — 2 cells in depth. Jeffrey* drew attention to the striking 

 resemblance between Yezonia and Brachyphyllum crassum and 

 fully justified his substitution of Brachyphyllum for the new genus. 

 Dr Stopes^, while agreeing with this conclusion, points out that 

 evidence furnished by fructifications can alone settle the question 

 of generic identity; she states that the supposed cone attributed 

 by Hollick and Jeffrey to Brachyphyllum differs widely from 

 Yezostrohus which may be the cone of the Japanese species. The 



1 Jeffrey (10') p. 768, PI. Lxv. fig. 6. ^ Thompson (12') PI. vi. fig. 12. 



3 Stopes and Fujii (10) p. 2.3. " Jeffrey (10'). 



^ Stopes (IP) 



