122 



s. MATöUDA. 



Sclerenchymatous fibres are also well developed. In tlie young 

 root the endodermis is distinctly seen, and the cells that constitute it 

 remain cellulose. The xylem-plates present the tetrarch arrangement, 

 but sometimes also the triarch. 



Trochodendron. 



To the present genus belongs the single species, T. anilioides^ 

 Sieb, et Zucc. It is n tree destitute of any aromatic property. It is 

 grown in many parts of Japan. Articles of various shapes are inade 

 from its wood by means of the turning-lathe. Its bark yields 

 bird-lime. 



Stem. — The epidermis is of the usual structure. The cuticle is 

 very well developed, and stride, which are perpendicular to the cuticular 

 surface, and coincident with the l)Oundary lines between the epidermal 

 cells, are distinctly seen. Cork is present immediately beneath the 

 epidermis. The hypoderma is represented by a layer of somewhat 

 thick-walled, closely arranged parenchymatous cells. The portion of 

 the outer cortex which lies within the hyp<jderma consists of a loose 

 tissue with manv interstices, and trichoblasts are here found in great 

 abundance. They are of peculiar shape and are characteristic of the 

 present species (PI. Ill, Fig. i)) j many-armed tricholjlasts are found 

 in a, few other genera of Magnoliacea', such as MiKjiKjlia and MichciiUj 

 but these are nuich simpler in form. 



The sclerenchymatous sheath is well developed and almost 

 uniiiten-ui)tedly encircles the fibro-vascular bundles. liesides these 

 fibres the sheath contains short sclerenchymatous cells or sclenjljlasts. 

 A great number of oil drops is found botli in the external cortex and 

 in the phloem. Witli the exception of a few spiral trachea' found in 

 the primary w<j<jd and of the pai'encliyma forming the medullary rays, 

 the whole xylem is made up of tracheïds. The walls oï the latter 



