140 



s. MAT8UDA. 



those elements which are usually found in this region of other Dicoty- 

 ledons, Ijut clear detection of them was generally very difficult, 

 and the presence of sieve-tuhes was pnjved only in a tew s{)ecies. In 

 Cciridijihiilhuii and all the three genera of MiUjnoUea: tlie hard-l)ast 

 or sclerenchymatous fibres are especially well developed, and are found 

 amonf tlie soft bast. Also in Kadinm and Schizandra sclerenchyma- 

 tous fibres are found among the soft bast, but these are heavily loaded 

 with miimte crystals, and transformed into the crystal-l)earing 

 sclerencliymatous fibres (1^1. IV. Fig. 20). Sacs containing crystals 

 exist in the phloem, as well as in the external cortex of Ccrcidi- 

 phiilhiui (PI. n, Fig. 5). In Kadziira and Scliimndra it is a remark- 

 able feature that there exist in this region large intercellular passages, 

 which serve as tlie reservoirs of mucilage. 



(3) Xiilem. — This portion generally consists of trachete, fibrous 

 elements, and wood-parenchyma. But T roch ode n Iron and Drinujs are 

 exceptional in this matter, their wood consisting abnost exclusively of 

 tracheïds. This [)eculiar structure of the xylem distinguishes these two 

 srenera from others of the Maunoliaceœ, and at the same time allies 

 them with Conifera3. But, as stated by Prantl,* their wood may be 

 distinguished from that of the lattn- f imily by the fact that in C(3nifera3 

 the cells of the medullary rays hav^e their longer axis horizontal, while 

 ill Drimys und Trocliodendron moHt of t\m cells of the medullary rays 

 have their longer axis vertical. lîorclered pits are found in the 

 tracheïds of 7);7'/»//,s and Trocliodendroii ; in the other genera where 

 vessels are present, pits of this kind are generally found in their walls. 

 It may be added that the exact determination of the various elements 

 that constitute the zylem was not very easy. 



(4) McdidJarij llaijs. — Their breadth varies, consisting mostly of a 

 single row of cells in Illlcliuu, Cereidiphiilhiiii, Scliizafulra, and Kadzura, 



* Engler and Prautl, Die natilrllclun Fßanzeiifamüien. 



