144 



s. MATSUDA. 



îuirl ci'vst;il-beai*ing sclerencliyinntons elements, whnt I have stnterl in 

 tlie case of the stein is a])p]icab]e here to tlie hlade. 



Root. 



The root, when it lieconies a little older, presents tlie same 

 structnre as tiie stem, except that the central portion, which corres- 

 ponds to the pith of the stem, is occnjned by the xylem. Generally 

 when sclerohlasts, secretory reservoirs, &c. are found in the stem, 

 they are also present in the root ; hnt in the case of lUic'nim rcUijio- 

 swn, sclerenchymatous elements are totally absent in tlie root, thon,o-h 

 a few fibres are present in the stem. In the yonnii' i'^'^^" I'^dial bundles 

 with the endodermis arc present in the central portion, and are sur- 

 rounded by the cortical ])arenchyma. The cells constitiitinii' the 

 endodermis oenerally remain cellulose. The Casj)ary point is not 

 clearly seen, l^ioth endodermis and ])ericambium are generally well 

 marked in the voung root, except in that of Trocliodcndron (PI. Ill, 

 Fio-, SV In a few cases a number of cells with liquified thick walls 

 are found in the cortical portion (PI. Ill, Fig. <S, cs ; PI. Y, Fig. o2, 

 r.s). The arrangement of the xylem-plates varies, tliere being usually 

 found the diarch, triarch. and tetrardi types, while the number is not 

 constant even in the same individual. In the single case of J/c^^///o//r< 

 (intudiffoni the tetrarch to heptarch arrangement is found. In this 

 resj)ect, therefore, any definite statement can not lie given. 



In all cases the numlier of xyleui-plates was detevmined only in young- brauchlets of the 

 secondary root, nnd not in the uiiin root proceedin»- direct fi'om the seedling, of winch, as I 

 have already mentioned, T conld olitain no specimens. 



Concluding Remarks. 



Plaving li'iven a ('om])arative view of the anatomical characters of 

 different genera of the present family, it remains now to summarise 

 the results of niv ol)scr\'ations, which are mai id v negative. Thus, I 



