Band 134. Nr. 19. XXXVIII. Jahrgang. 1. Bd. Nr. 19. 



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-Commissions- Mitglieder: 



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



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



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 19 . 



Abonnement für das halbe Jahr 15 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1917. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

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



Ganong, W. F., A Textbook ofbotany for Colleges, pp. XI 

 H- 401 , 274 ff, New York , The Macmillan Company, 1916. price $ 2.00.) 



The present volurae, which is to be supplemented by a second 

 part dealing with the kinds and relationships of plants, contains 

 chapters on The scope and value of botanical study, The distinctive 

 characteristics of plants, The morphology and physiology of leaves, 

 of Sterns, of roots, of flowers, of fruits, and of seeds. Though for 

 the most part not new, the illustrations are apt to their purpose. 



Trelease. 



Barrat, K., A note on an abnormality in the stem of Heli- 

 anthus anniius. (Ann. Bot. XXX. p. 481—484. 3 textfigs. 1916.) 



In this note a Variation in structure which was found in a short. 

 length of stem taken from a young plant of Helianthus annuiis is 

 described. Two distinct abnormalities were presented by the spe- 

 cimen: 



1°. A deviation from the normal longitudinal course of one of 

 the leaf-trace bundles, which, instead of taking a vertical direction 

 parallel to the neighbouring bundles, passed obliquely downwards 

 and inwards, entering the pith and becoming completely separated 

 from and interior to the other vascular Strands. 



2. A development of secondary vascular tissue in connection 

 with the displaced bündle, resulting in the formation of a concen- 

 tric bündle with internal phloem and external xylem. 



Agnes Arber (Cambridge), 



Bjtaa. Centralblatt. Band 131. 19 7. 19 



