THE nnTAXKAL MAQAZttifi. [Voi.xxt.No.24i. 



It should be granted that most stress should be put upon the 

 form of the cone, in systematizing Conifers. Taiwania, there- 

 tore, should be assigned the next place to Cunninghamia. As 

 Arthrotaxis bears some resemblance to Tahvania in the form 

 of its cones and leaves, it should be put next to Taiwania. 

 After considering all these cases, I was, at last, forced to the 

 conclusion that Taiwania should be placed between 

 Cunninghamia and Arthrotaxis. 



So much as to the external relation of Taiwania to other 

 genera. Lastly, a few lines should be given to the consideration 

 of the histology of this genus. I do not think, however, that 

 I should dwell upon its particular anatomy, nor will I enter 

 upon the phylogenieal study of the organs. On this occasion, 

 I must be content to examine whether or not the above 

 conclusion will hold good about its histological relation. 



I will here take the leaf for my study. As shown in 

 Plate I, Fig. 14, the leaf of Taiwania is rhomboidal in its out- 

 line with two acute edges on both sides, and round surfaces 

 above and below. The epidermis (ep), as seen in many Conifers, 

 has a well-thickened wall, and under it the hypodermis (hy) 

 is equally well developed lying in a single layer. But in some 

 portion of the surface (st) where a great number of stomata 

 are scattered, the hypodermal layers are generally omitted. 

 Internally, the chlorophyll-parenchyma is equally arranged all 

 round the surface; but it becomes looser towards the centre. 

 The vascular bundle and resin canal are generally seen in the 

 centre. In both sides of the medial bundle, there are clearly 

 seen transfusion tissues, that peculiarity of Conifer leaves. 

 The tissue consists of trachcids with bordered pits and beams. 



I shall try to compare these histological points with those 

 of Cunninghamia. In the leaves of Cunninghamia, the hypo- 

 dermis is most developed and sometimes sclcrcnchymatous fibres 

 are seen scattered withen the parenchyma, which is entirely 

 absent in Taiwania, Now come to Cryptomeria, and we see the 

 hypodermis is the least developed. In this respect, Taiwania 



I i. I operative Anatomy of tiie Phanerogams and Ferns p. 381. 



