sept. i9io.] SUZUKI.— ON THE STRUCTURE AND AFFINITIES 191 



As an instance where the difference in the development of 

 hypoderma was considered as an important point of anatomical 

 distinction between the leaves of the two species the case of 

 Tsuga Sieholdii and Tsuga diversifolia may be mentioned. In 

 the former the tipper hypoderma is sparingly developed or 

 greatly interrupted, while in the latter it is continuous 

 (Mayr 7). 



Thus the present plant seems to be well qualified to be 

 separated from Cryptomeriopsis antiqua Stopes et Fujii. 



I named this species Cryptomeriopsis mesozoica, from the 

 geological era in which it existed. 



Diagnosis : — 



Cryptomeriopsis mesozoica sp. nov. 



General aspect of the leafy twig like Cryptomeria, leaves 

 rhomboidal in transverse section, with a single endarch 

 vascular bundle without bundle sheath, development of trans- 

 fusion tissue in the leaf much greater than in Cryptomeria ; 

 mesophyll, cortex and pith with stone cells ; stomates and 

 sclerenchymatous hypoderma absent in the upper side of the 

 leaf, hypoderma in the under side of the leaf either entirely- a 

 single layer of cells, or 2—6 layers of cells on the median 

 portion of the leaf; secondary phloem, when its tissues are 

 regularly arranged, consisting of alternate zones of single layer 

 of bast-fibres and double layers of sieve-tubes without inter- 

 venation of phloem-parenchyma. 



Locality : — Upper Cretaceous, Hokkaido, Japan. 



Pleosporites Shirainus. 



(Text-figs. 2 and 3. Photo 6, Plate VII). 



It has been stated before that all soft tissues of the leaves 

 and axes of Cryptomeriopsis mesozoica were infected with fungal 

 hyphae, and that a kind of fructifications was found in the leaves 

 (Phot. 6, PL VII), 



