Band 119. Nr. 19. XXXIII. Jahrgang. I. Bd. Nr. 19. 



Botanisches Centralblatt. 



Referirendes Organ 



der 



Association Internationale desBotanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten: des Vice- Präsidenten: des Secretärs: 



Prof. Dr. E. Warming. Prof. Dr. F. W. Oliver. Dr. J. P. Lotjy. 



und der Redactions-Commissions-Mitglieder: 



Prof. Dr. Wm. Trelease, Dr. R. Pampanini, Prof. Dr. F. W. Oliver, 

 Prof. Dr. C. Wehmer und Dr. C. H. Ostenfeld. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 19. 



1912. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralblattes, Haarlem (Holland), Spaarnei7. 



Agrelius, F. U. G., Investigations regarding the phloem 

 and foodconduction in plant s. (Kansas Univ. Sei. Bull. V. 

 p. 169-175. pl. 36-37. Apr. 1910.) 



A large number of plants in spring and summer were examined. 

 Special devices for the better lateral transfer of foods present in the 

 phloem and cortex were found to consist of ä) pitted walls; b) the 

 arrangement of the phloem in narrow wedges in the pericycle cells, 

 sweeping around these and connecting with the medullary rays, 

 and c) radially elongated medullary ray cells adapted readily to 

 conduet the food as stated. Sieve tubes with perforated sieve plates 

 were demonstrated in practically all plants studied although pro- 

 bably almost functionless in some cases. Relatively the amount of 

 phloem and xylem does not vary in the various parts of the plant, — 

 the main difference being in other tissues. Moore. 



Anderson, J. R., Plants injured by creosote. (Ottawa Nat. 

 XXIV. p. 128. 1910.) 



Record ol" injury to roses, delphiniums, laureis, maples, ferns 

 and other plants apparently due to creosote exhalations from treated 

 paving blocks. The leaves turn black and fall before maturity. 



Moore. 



Botan. Centralblatt. Band 119. 1912. 30 



