14G ö. MAT8UDA. 



cortical portion of botli stem and petiole, (iii 

 a .single case only the libres in the petiole remain- 

 ing unlignified). Resin-sacs wanting : 

 a. With a great number of triclioljlasts in the 

 outer cortex, as well as in the mesophyll ; 

 wood almost exchisively consisting of 

 tracheïds : 



Twchodendroii. Tribe T roch ode ndrea\ 

 h. Cells containing single prismatic crystals 

 abundantly found in tlie cortex of the stem : 

 Cercidiplujllwn. Tribe Trockodcndreœ, 

 c. Cells containino- an aoorefi'ate of minute 

 crystals often present in the outer cortex of 

 the stem ; each aggregate presenting a stel- 

 late appearance : 



Enptckm. Trilje TrocJiodendmi'. 

 As will be seen from the above synopsis, the four tribes of 

 Magnoliacea3 may be distinguished from one another by certain 

 anatomical characters more or less peculiar to each. Of these four 

 triljes Mcujnolieo' and Scliizundrea' are well defined in tlieir characters 

 and may be easily distinguished not only from etich other, l)ut from 

 either of the other tribes. Altln^ugh tinsse two tribes are included in 

 the same family by most botanists, yet there does not exist any 

 anatomical character which seems to 1)e sufficient to connect them. 

 It is true that the secretory reservoirs found in tlie cortex of Manual (ctr, 

 are faintly represented in Schi'uiiulrcü' by reservoirs quite different in 

 forju; and that the diaphragms in the pith of Magnolieœ are said to be 

 represented in Schizandreœ by a few sclerencliyniatous cells.* But I 

 hesitate to consider these points as sufficient connecting links, 



* Bâillon, Natural History of Plants (Translated from the French). 



