ON THE ANATOMY OF MAGNOLIACE^. 141 



hut of several rows in TroclioiIcNdrnu. In Mufinolieœ d\iïeve.nt hrencUlis 

 are fonnd. In the pliloc'in rays of Evptchva a few scattered sHero- 

 blasts find their way among soft parenchymatous cells (PI. II, Fig. 



1, 4 



7. ]*ith — The parenchymatous cells of the pith are completely 

 lignified in Ccrcidiphijlhnn^ Drimijs, and Twchoilendron, even in young 

 spefimens. This is also the case in lllichim Tasliiroi, hut in lUicium 

 relitj'umnn they are unlignified in y(Ming specimens. The young stem 

 of Eiiptehrn (^ften has a small jiortion of the pith remaining unlignified. 

 The parenchymatous cells of the pith are unlignified in Kathura and 

 Scliiranihri, hut a few sclerenchymatous cells are found in it (PI. 

 IV. Fig. IT)). ^[(KjuoJieiv are distinguished by the existence of 

 dia])hragms in their ])ifh (PL V, Fig. 27, J»?), the only part of the 

 pith that liere becomes lignified. As I have stated before, the asserted 

 existence of stone-cells in the ])ith of JUicicœ is not verified by my 

 specimens. 



Petiole. 



The structure of the stem having been comparatively described, 

 there remains scarcely anything to be said of the petic^le. I will here 

 only notice a few anatomical ])oints in which the structiu'e of fhe 

 petiole deviates from that of the stem. 



The epidermal hairs are generally more strongly developed in 

 the petiole than in the stem, as we see in many species of Maijunlia ; 

 and even Evptehva, which bears no hair on its stem, has a, few on the 

 petiole. In those s])ecies which contain resin-sacs, sclerol)lasts, and 

 tri('hol)lasts in their stem, the presence of the same in tlie petiole is 

 almost certain, as is also the case with crystal -bearing sclerenchymatous 

 elements. A number of crystals is found in the outer cortex of the 

 jtctiojc of Sell i Id mini, tliough none is })resent in the stem. The fibro- 



