Band 114. Nr. 25. XXXI. Jahrgang. IL Bd. Nr. 25. 



Botanisches Centralblatt, 



Referireüdes 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. Wim. Trelease, Dr. R. Pampanini, Prof. Dr. F. W. Oliver 



und Prof. Dr. C. Wehmer. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 51. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten, 



1910. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

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

 dijkstraat 15. 



Saxton, W. T., Notes on the Anatomy of Widdringtonia 

 and Callitris. (South Af ricain Journ. Sc. VI. 7. p. 282—286. ill. 

 1910.) 



In two species of Callitris thickenings of the cellwall are found 

 to occur in connection with the bordered pits, and the wood is also 

 characterised by concentric rings of secretory cells. There is a 

 thickvv^alled hypoderm in the leaf. 



None of these features occur in Widdringtonia cupressoides , but 

 peculiar tracheids are found, w^ith elongated bordered pits on the 

 tangential walls. 



The author concludes that, as far as these observations go, 

 they point to a sharp Separation in anatomical characters between 

 the genera Widdringtonia and Callitris. 



Agnes Arber (Cambridge.) 



Stubbs, F. J., Earwigs as the Guests of Plants. (Lancashire 

 Nat. II. 14. p. 148-151. 1909.) 



The author has observed the frequent presence of Forficula 

 auricidaria in the petiole-sheaths of üinhelliferae {Heracleum sphon- 

 dylium and Angelica sylvestris). He regards the sheaths as speciall}'" 

 adapted for shelter of the Earwigs by da5^ and notes that the 

 plants themselves are not attacked b}^ these insects. A symbiotic 

 Union is suggested. Other organisms and remains found in the 

 sheaths are given. W. G. Smith. 



Botan. Centralblatt. Band 114. 1910. 41 



