EXPLANATION OP PLATES. 



PL XVIII. lodes tomen- 

 tella Miq. 



Fig. 1. Cross-section of an internode, 

 X14: r ring of first-formed secon- 

 dary wood ; I ^ I lobes of secondary 

 wood which are later formed; mr 

 multiseriate medullary ray; sx areas 

 of parenchymatous xylem; h^V^ nor- 

 mally oriented phloem ; 'pc pericycle ; 

 col. collenchyma ; vd periderm ; }fi 

 bast in the medullary tissue; mr 

 medullary ray of the anomalous 

 phloem-formation ; p pith , p' cru- 

 shed cells of the pith; It vascular 

 bundles of the leaf-traces from the 

 first higher node; U leaf-trace-bun- 

 dles of the second node above ; hr 

 bundles from the developing branch ; 

 a b bundles from the abortive buds 

 opposite the branch ; t bundle from 

 the tendril; u four bundles formed 

 by the union of the bundles of the 

 internodes above. 



Fig. 2. Cross-section of one of the fibro- 

 vascular formations of the pith X 152 : 

 c anomalous cambium ; s/ sieve-tube; 

 sp sieve-plate; (/z Geleitzelle; t tra- 

 cheid; i7ir' medullary ray; p pith; 

 Im lignified medullary tissue ; pv pri- 

 mary vessel; pel pitted duct; r ring 

 of normally oriented secondary wood. 



Fig. 3. Cross-section of a strip of the 

 anomalous cambium at an early 

 stage of its development; c cam- 

 bium; p pith; p' lignified cells at 

 the periphery of the pith ; pv pri- 

 mary vessel ; pd pitted duct. 



Fig. 4. Cross-section through a mode- 

 rately thickened node, X 14: r 

 ring of first-formed secondary wood; 

 l^l^ etc wood of the prominences; 

 n, n parenchymatous bays dividing 

 each lobe into two parts; b nor- 

 mally oriented phloem ; pc pericycle ; 

 cp cortical parenchyma ; It outgoing 

 leaf-traces; t base of the tendril; 

 h' anomalous phloem; c normally 

 oriented cambium ; c inverted cam- 

 biums of the pith; 0, o parenchy- 

 matous openings through which the 

 normal and anomalous cambiums are 

 connected with each other; sp se- 

 condary parenchyma containing a 

 few scattered sieve-tubes. 



PI. XIX. 



Figs 1 — 4. lodes tomentella Miq. 



Fig. 1. Median longitudinal section 

 through a rather young node , X 6 : 

 I older internode; i^ younger inter- 

 node (apparent morphological axis); 

 p,p bases of petioles; br developed 

 branch ; a 6' a V^ etc abortive buds ; 

 m pith; sw secondary wood; sb se- 

 condary bast; o, the same paren- 

 chymatous communications between 

 pith and cortical parenchyma seen 

 in PI. XVIII, Fig. 4. The tendril 

 not lying in the plane of the section 

 does not appear in the figure. 



Fig. 2. Diagram of the course of the 

 anomalous formations in the medul- 

 lary tissue, the main figure showing 

 their longitudinal course, and the 



