ON THE ANATOMY OF MAGNOLIA OETR. 



148 



Tliese rido-es nre also observable in Eiiptelfra, and less distinctlv in 

 Ccrcidij)]nilliiiii, but are wanting in Trochodcmlrou whicb with these two 

 o'enera forms Trocliodendnvr. Epidermal hairs are generally found in 

 M(«juoJii( and DlicheUa, and also in EupfeJoYi, l)ut in other genera are 

 almost wanting. In general the stomata do not ])resent any 

 ]>eculiarity, being elliptical in form and a('C(^m])anied by the two guard- 

 cells, but in Maiinolid (imndiffoni their form is nearly spherical 

 and the guard-cells are ]iressed outward, so that they rest u])on the 

 neighbouring epiilermal cells. Both in Maffnolia pvmHa and Twchn- 

 dt'iidi-oN iinilioidcx. the cuticle is much raised around the entrance of 

 tlie stomnta. and ])resents a cup-like a])])earance (PI. Ill, Fig. 10 ; PI. 

 V, Fig. oO). The arrangement (^f the fibro-yascular bundles of the 

 midril) is circular in Maijnolhuv, semi-circular in fJlicicœ and Selii:nn- 

 drtw. In all these cases the bundle arrangement of the ])etiole agrees 

 with that of the midrib. In ('t'lcidifdijiJlinii and Euptekm the Inindles 

 are circularly arranged in the ])etioIe, but in the former they are seini- 

 cii'cularly arranged in the midrib, wliile in the latter their circle is 

 incom])lete in this ])art. F)ut Trochodeudron aralioidt's has the bundles 

 semi-circularly arranged both in ]ietiole and midrib. Thus in this 

 res])ect the tliree genera (^f Tmrhodcndnuc do not agree with one another. 

 I»esin-s:ics are present in the mesophyll, as well as in the midrib of 

 the examined three genera of Maçiuoliew. They ai'e also jn-esent in 

 these parts oî DrimnA d.ipctala, but have not been observed in those of 

 Jllicimn religiosum or of Schizaudrav and Trorhnd(>ndrra'. although in 

 the former of these the occurrence of mur-ilage canals both in the 

 mesophyll and the midrib is very common, fhe blade in a few genera 

 contains crystals. Thus aoföreoates of crvstals are found in the 

 cortical region of the midrib of Eiiftfehrn and Cercidiphylhim, and in 

 that of ScliiztiNdrn. In DriDU/s dij>('t(d(( the e])idermal cells contain a 

 number oi' (Tvstals. As to the existence of scleroblasts. trichoblasts, 



