Bd. XCIII. Nr. 6. XXIV. Jahrgang. 



Botanisches Ceiitralblatt. 



Referirendes Organ 



der 



Association Internationale des Botanistes 



für das Gesammtgebiet der Botanik, 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice-Präsidenten : des Secretärs : 



Prof. Dr. K. Goebel. Prof. Dr. F. 0. Bower. Dr. J. P. Lotsy. 



und der Redactions-Commissions-Mitglieder : 



Prof. Dr. Ch. Flahault und Dr. Wm. Trelease. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur 



1^ -yj I Abonnement für das halbe Jahr 14 Mark 100^ 



j durch alle Buchhandlungen und Postanstalten. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Oude Rijn 33 a. 



Tansley, A. G. and Chick, Edith, On theStructure o{ 

 Schlzaea Malaccana. (Annais of Botany. 1903. Vol. XVII. 

 No. LXVII p. 493—510. Plates XXV and XXVI.) 



The vascular System of this plant consists of a single 

 central stele which varies considerably in structure. In the 

 simplest case there is a ring of xylem and phloem surrounding 

 a true „intra-stelar pith'' of thin-walled parenchymatous cells; 

 the vascular ring being completely interrupted by the departure 

 of each leaf-trace. In other cases an internal endodermis is to 

 be found within the pith surrounding one or more cells similar 

 in character to those of the cortex. The internal endodermis 

 ends blindly below, but is usually continuous with the outer 

 endodermis through the leaf-gap next above, at which point 

 also the enclosed cells are continuous with the cortex. Many 

 of the leaf-gaps, however, have no endodermal pouches con- 

 nected with them at all. In one case the internal endodermis 

 was found to be entirely isolated, ending blindly both above 

 and below. Sometimes, again, it does not Surround any cells 

 at all, being represented by a solid Strand or a single row of 

 cells with endodermal markings. Small Strands of tracheides 

 sometimes occur in the pith which are distinct from the xylem 

 ring, they may, however, be connected with it at one end. 



The leaf-trace is collateral. A single median Strand of 

 protoxylem is found on the adaxial side of the xylem, but it 

 is not prolonged into the stem where all the xylem Clements 

 are scalariform. 



The authors give a detailed description of the apical 



Botan. Centralbl. Bd. XCIII. 1903. 9 



