ON THE ANATOMY Oi' MAGNOLIACEJS. J 39 



met witli ill Mngnoliuceiu. Trichoblast« are very abundantly found in 

 the external cortex of Trocliodemîro'n, and send their arms freely into 

 the intercellular spaces which also abound in this region (PI. Ill, 

 Figs. 7 and 9). Their presence is a feature that distinguishes this genus 

 from others. Scleroblasts are generally found in Maijinjliece, and in 

 many cases are accompanied by trichoblasts. The external cortex of 

 Illicinm, (perhaps of Drùiu/s also), Eupteliea, and CercidiphylluDi is 

 entirely destitute of them. Kadziira and Schizamlra contain in their 

 outer cortex and less often in their inner one a number of crystal- 

 bearing sclerenchyniatous cells (V\. IV, Fig. 20), which are nothing 

 more than scleroblasts with numerous crystals imbedded in their walls. 

 Some of these cells are elongated and form crystal-bearing sclerenchy- 

 niatous fibres. 



6. Fihro-rascidar Bandies. — The fibro-vascular bundles existing 

 in the stem of Magnoliacese belong to the so-called collateral bundles, 

 which are uni\ers;illy foiuid in the stem of phanerogams, so that it is 

 unnecessary to give an acc(junt of their general features. But there 

 are certain structural points in the bundles peculiar to different genera 

 which need to be noticed briefly under the following heads : 



(1) Sclcrencliiimatous Sheatli. — This is made u}) of sclerenchy- 

 niatous fibres often accomjKinied by scleroblasts, and is more or less 

 developed in all the genern. Howe^^er, in Illicium it is very imper- 

 fectl}' represented by scattered fibres that are found at the external 

 limit of the phloem. It is })oorly developed in Kadzura and Sltizandra 

 (PI. IV, Fig. lo, .s7) ; rather well developed in Eiiptehra and Ccrcidi- 

 plujlhnii; in 'rrucliodendroN and all the three genera of Jic/^/wZ/ca' most 

 strongly developed aud, together with a number of scleroblasts exist- 

 ing there, constitutes an almost continuous ring of sclerenchyina. 

 Such is also the case in Driiniis. 



(!?) Vltloeiii. — The soft portion of the phloem probably contains 



