Band 140. Nr. 4. XL. Jahrgang. I. Bd. Nr. 4. 



Botanisches Centralblatt 



Referierendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 



des Präsidenten: des Vice- Präsidenten: des Secretärs: 



Dr D. H. Scott. Prof. Dr. Wm. Trelease. Dr. J. P. Lotsy. 



und der Redactions-Conftnissions- Mitglieder : 



Prof. Dr. Wm. Trelease, Dr. C. Bonaventura, A. D. Cotton, 



Prof. Dr. C. Wehmer und Mag. C. Christensen. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 4. 



Abonnement für das halbe Jahr J^ Mark 

 durch alle Buchhandlunsfen und Postanstalten. 



1919. 



Alle für ^Q Reäaction bestimmten Sendtmg'en sind zu richten an: 

 Redaction des Botanischen Centralblattes, Haarlem (Holland), Spaarneiy. 



Hoffstadt, R. E., The vascular anatomy oi Piper methysticutn. 

 :Botan. Gazette. LXII. p. 115-132. 23 Fig. 1916.) 



The Stern of Piper methysticuin consists of two Systems of 

 bundles, peripheral and pith, the latter being in two rows. The 

 peripherai bundles are of two sizes: primar3^ the larger; secondary, 

 the smaller. The latter are branches of the former. The bündle type 

 is collateral endarch. 



The bundles are of foliar origin. After entering the stem, they 

 remain in the peripheral region through one internode and then 

 traverse the pith for two internodes. 



ßoth the peripheral and pith bundles show anastomoses. 



The pericycle consists of only a few cells outside the bundles, 

 which become lignified. There is no differentiated endodermis. The 

 stem enlarges by cambial activit}^ and divisions in the pith region. 

 An interfascicular cambium appears late in the internode and cuts 

 off Segments only on one side; it comes still later in the nodes. 



Leaf traces are many. The base of the leaf is sheathing and 

 vernation is involute. Buds vary in number and position. 



Piper umhellatum differs from P. ntethysticum in the foUowing 

 ways: 1. one ring of pith bundles only; 2. the mucilage canal runs 

 through the center of stem and node; 3. the bundles run through 

 one internode only in the periphery and one in the pith before 

 fusing with those of the leaf above 



Both stems are packed, especially when young, with starch, 

 piperin, and mucilage. 



There are no growth rings. 



The anatomy of P. methysticum and of P. umbellatum agree 

 for the most part with the anatomy of the species of Piper already 



Boten. Centralblatt. Band 140. 1919. 4 



