23 



We see from the foregoing that two utterly different structural typefl 

 occur in the root, in no way as parallel formations within the same genus, 

 but as being respectively common to all the members not only of a genus, 

 bat even of allied genera, such as Jirundinaria and Phyllostachys on the 

 one hand, and Bambusa and Dendrocalamus on the other. At any rate 

 they are both equally rational constructions viewed from the physiological 

 standpoint and may be regarded as the phyletic characters indicating the 

 natural relationship existing between allied genera. 



Now we will return to the proper subject of our present discussion and 

 examine the root- structure of the indigenous species formerly included in the 

 genus Bambusa, such as B. senanensis, B. VcitcMi, B. palmata, B. horealis, 

 B. nipponica, B. ramosa, B. cliartacca, etc. The roots of all these species 

 possess, however, no feature common with the BambusaAjpe, but they are, 

 on the contrary, constructed in an exactly similar manner with those of 

 Arundinariea?, so that it seems to us quite superfluous to enter into their 

 detailed descriptions. The comparison of Figs 18 and 19 (PL I.) (Bam- 

 liisa slenostachya) with Figs. 16 and 17. (Sasa (' Bambusa') boreal is) 

 will make the difference existing between them at once manifest. It may 

 be here noted in passing that the embryonal roots (" Keimwurzel") of the 

 seedlings of Bambusa nanap Arundinaria Simoni and Sasa (' Bambusa') 

 horealis repeat respectively in every detail the construction-types of the 

 adult plants, and consequently no room is left for doubting that they are 

 constant hereditary characters. It should also be added that the character* 

 istic parenchyma~lamelUe 2) inserted transversely in the bundle-sheaths, which 

 are never absent in the culms of Bambusa and Dendrocalamus, are hardly 

 discernible in those of the members of our new genus. 



It is evident that the plants which present such a striking deviation 

 in the important phyletic characters, as seen from the above discussion, can 

 no longer be brought together under the same genus, and it follows neces- 

 sarily that the above named indigenous ' Bambusa '-species should be 

 rationally separated from Bambusa, while the possession of six stamens 

 suffices to characterise a distinct genus. 



Species and Distribution. 



The above considerations relating to exomorphic as well as to endo- 



])AVe arc indebted to Dr. K. Fujii for kindly giving us some seeds of this species. 

 2) Sch wendener, Das meclianische Princip in anat. Bau d. Monoeotylen. p. 05; 

 K. Shibata, he. eit, p. 441. 



