Band 122. Nr. 17. XXXIV. Jahrgang. I. Bd. Nr. 17. 



Botanisches Centralblatt 



Referirendes Organ 



der 



Association Internationale des Botanistes 

 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. Lotsy. 



und der Redactions-Commissions- Mitglieder : 



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



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



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 17. 



Abonnement für das halbe Jahr 14 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1913. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralblattes, Haarlem (Holland), Spaarne 17, 



Groom, P., The medullary Rays of Fagaceae. (Ann. Bot. 

 XXVI. 104. p. 1124—1125. Oct. 1912.) 



The author gives some details of a paper by Zijlstra on the 

 medullary ra3's in the secondary wood of Fagus and Quercus. 



Zijlstra shewed that in the Fagaceae both primary and secon- 

 dary rays can fray outwardly into separate smaller ones. and the 

 linking up of separate rays from within is not confined 10 the 

 annual rings of the seedling stem or to primary medullary rays. 



The author refers to a criticism in J. W. Bailey's paper (Ann. 

 of Bot. XXVI, p. 647—661) in regard to Quercus spicata, and points 

 out that his and Bailey's specimens may not be identical species, 

 and that the latter's Statement is not therefore justified. 



E. de Fraine. 



Michell, R. M., On the Comparative Anatomy of the Ge- 

 nera Ceraria and Portiilacaria. (Ann. Bot. XXVI. 104. p. IUI — 

 1122. 1 pl. 4 textfig. Oct. 1912.) 



The author gives a short account of the habit and external 

 characters of Ceraria. (NO. Portulaceae), and describes the anatomy 

 of the stem and leaf of C. gariepina and C. namaquensis; no great 

 structural difference between Ceraria and Portulacaria afra is found. 



It is concluded from the anatomy that a close relationship exists 

 between the two genera. E. de Fraine. 



Abderhalden, E., Neuere Anschauungen über den Bau 



Botan. Centralblatt. Band 122. 1913. 2-5 



