Band 126. Nr. 10. XXXV. Jahrgang. II. Bd. Nr. 10. 



Botanisches Centralblatt 



Relerirendes 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-Commissions-iMit^lieder : 



Prol. Dr. Wm. Trelease, Dr. C. Bonaventura, A. D. Gotton» 



Prot. Dr. C. Wehmer und Dr. C. H. Ostenfeld. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 36. 



Abonnement für das halbe Jahr J5 Mark 

 durch alle Buchhandlungen und Postanstalten. 



19U. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

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



Lee , E., Observations on the Seedling Anatomy ofCer- 

 tajn Sympeialae. II. Compositae. (Ann. of Bot. XXVIII. p. 

 303—329. 11 Diagr. 2 Textfig. April 1914.) 



The seedling structure of about 50 species of seedling Compo- 

 sitae is described, onl}' one type of transition occurs (Van Tieghem's 

 Tj^pe 3). The diarch type (e. g. Cichorium Intybus is connected by 

 all stages with the tetrarch type of root structure (e. g. Silphium 

 perfoliatiim), and variations may occur even in different examples 

 of the same species, thus indicating the valueless nature of seedling 

 anatomy in connection with aßinit3^ The question of the primitive- 

 ness of the diarch or of the tetrarch type of root is discussed, the 

 author concluding that tetrarchy and diarchy have probably inter- 

 changed several times during the course of evolution, and further 

 that the evolution of the vascular structures of cotyledons is probably 

 not an extremelj'' slow process. The importance of the size of the 

 lateral cotyledonary bundles and the level at which these unite with 

 the midrib, is discussed, the conclusion reached being, that these 

 factors alone are inadequate to determine the root nature. Further 

 that the size of the seedling is not always correlated with the type 

 of structure. 



Finally, the author considers that physiological factors alone are 

 insufücient to account for the structures found in seedlings, and 

 that possiblv factors connected with the nature of the organism are 

 also concerned. E. de Fraine. 



Arber, A., On Root Development in Stratiotes aloidesl^. \N\\.h 

 special reference to the occurrence of Amitosis in an 



Botan. Ceatralblatt. Band 126. 1914. 16 



