Band 117. Nr. 8. XXXII. Jahrgang, IL Bd. Nr. 8. 



Botanisches Gentralblatt 



Referirendes Organ 



der 



AssociationliiternationaledesBotanistes 

 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. Treiease, Dr. R. Pampanini, Prof. Dr. F. W. Oliver, 

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



von zahlreichen Specialredacteuren in den verschiedenen Ländern 



Or. J. P. Lotsy, Chefredacteur. 



No. U. 



Abonnement für das halbe Jahr 14 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1911. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralblattes, Leiden (Holland), Bilder- 

 dijkstraat 15. 



Earaes, A. J,, On the Origin of the Herbaceous Type in 

 the Angiosperms. (Ann. Bot. XXV. p. 215—224. 1 Plate. 1911.) 



The author considers that the prevailing view, which regards 

 the solid woody cylinder of the Angiosperms as resulting from the 

 fusion of a group of originally separate bundles, is incorrect. He 

 brings forward evidence to shew that a reverse process has taken 

 place, and that the herbaceous stem is the higher type. 



Direct developmentai proof is supplied by some of the herba- 

 ceous perennial Rosaceae, shewing that a primitively solid cylinder 

 has been reduced and dissected to form a ring of small separate 

 bundles. 



The impetus, which has brought about the great change, has 

 probably been given by the leaf-trace, and has been effected by the 

 transformation of large or small masses of secondary wood into 

 storage parenchyma, in those segments of the woody cylinder 

 directly related to the leaf-trace. 



The two genera Aristolochia ann Clematis appear at first sight 

 to support the older view, bul a developmentai and anatomical study 

 of them lends further support to the newer view. 



E. de Fraine (London). 



Frame, E. de The Seedling Structure ofcertain Cactaceae. 



(Ann. Bot. XXIV. p. 125—175. 18 Diagramsand 19Textfigures. 1910.) 



A detailed account of the anatomy and method of transition 



Botin. OentralblaU. Band 117. 1911. 12 



