113 s. MATSUDA. 



Euplelaea. 



E. polijaudra, Siel), et Zucc, is tlie only sjiecie.s of this genus 

 which I examined. It is a small tree, found in many parts of Japan, 

 in which the aromatic property so common in Mngnoliacea^ is entirely 

 absent. 



Stem. — The epidermal cells present no peculiarity ; the cuticle is 

 not well developed. There is found on the e])idermis a number of 

 lenticels, which appear to the naked eye as white sjiecks. Cork is 

 developed inunediately beneath the epidermis, its cells being of 

 com])aratively large size, while those forming the other tissues are 

 generally very small. The hypodermn is represented by n layer of 

 somewhîit thick-walled parenchymatous cells bene;ith the cork. 

 Sclerenchymatous elements of any kind nre totally al)sent in the 

 outer cortex ; but there are found in it many sacs, each of which 

 contnins an aggregate of crystals of calcium oxîdate (PI. IT, Fig. 2). 



The sclerenchymatous ring which accompanies the fibro-vasculnr 

 bundles is well developed, but is interrn|)ted at the points where the 

 large medullary rays run radially througli the ])hloëm (PI. II, Fig. 1). 

 Sclerenchymatous elements are absent in the inner phlorm ; btif 

 a few scleroblasts -find their wny into those jxn-tions of the ])hlo('m 

 rays which run near the sclerenchymatous ring (PI. TT. Fig. 1. .s). 

 In .specimens collected while the cambial zone is in activity, tliere is 

 seldom seen any marked distinction between that zone and the xyleni, 

 gradual transition taking place from lignified cells to uidignified ones. 

 (PI. II, Fig. 1). In the phloem |)ortion sieve-tubes are distinctly to 

 be seen, especially in longitudinal sections. The xylem contains 

 vessels, tracheïds, fibres, and wood-|)arenchyiua. The vessels general- 

 ly have fibrous markings on their walls. In those portions of the 

 xylem whicli border on the pith and constitute the medullary sheath 

 there aiv found, in yonng s])eciinens, grouj)s of elongated cells with 



