128 



s. MATSUDA. 



b;il)lv the s(^nrce of tlie cbarneteristic odour which the plants o'ive ont 

 wlien bruised. These cells are conspicuous in Schiiniuhri l)y tlieii* size, 

 beinu' much larii-er than the cells of the surroundino- parenchymatous 

 «•ells, but" in 7v. japoidca the oil-cells are scarcely lars^er than the 

 surrounding cells, and are. besides, seldom met with. The cells of the 

 (•ortic;d pareiK'byma are sometimes pitted in /\'. jdpnuica (PI. TV. Fig. 

 14). 



Sclerenchvmatous fibres are generally found at the external 

 limit of the phloem, constituting the sclerenchvmatous slieath, but 

 they are not much crowded, either forming only a thin layer (jr else 

 small grou])s (PI, FY, Fig. lo. .s7). Some of these fibres are septate, 

 as may be seen in K. jd/ioHicd (V\. TV, Fig. '2\). Scattered about 

 in the ])hl«H'm (and als(^ in the external cortex) tliei-e are found 

 peculiar cells with tliick lignified walls and a narnnv lumen (IM. IX, 

 Fig. '20). Some of these cells are elongated like sclerenchyuiatous 

 fibres, others are very short, simply round in form, or else provided 

 Avith arms, which they ])ush out freely among the surrounding cells. 

 The outer layer of theii' thickened wall contains a great number of 

 granules (^f calcium oxalate, which present an angular configurati(Mi, 

 without the definite form of true crystals. These peculiar elements are 

 structurally nothing else than sclerenchymatous filtres or scleroblasts. 

 liolding a number of grannies imbedded close to one another in their 

 walls, and for convenience' sake I will hei-eaftei' call them "crystal- 

 bearing sclerenchymatous elements." I do not think tliat there exists 

 any essential difference between them and the so-called spicular cells 

 of WelwiUchia mirahil/Sj which liave been described by several authors, 

 and are stated to he of tl>e same nature as the crystal -bearing fibres 

 found in Amiicnria. &c. Ff I am right, the interesting fact is 

 supplied of two gi'oups of plants which arc remote from eacli other in 

 systematic jtositiou coiitaiiiiiiL;- a nci'v similar elciuent in their 



