Band 141. Nr. 17. XL. Jahrgang. IL Bd. Nr. 17. 



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, A. D. Cotton, 



Prof. Dr. C. Wehmer und Mag. C. Christensen. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 42. 



Abonnement für das halbe Jahr 25 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1919. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralblattes, Haarlem (Holland), Spaarnei7. 



Journal of the Arnold Arboretum. I. N° 1. (Cambridge, The 

 Riverside Press. July 1919.) 



A new octavo serial, edited by C. S. Sargent, to appear 

 quarterly, at $ 3,00 per year. Supplementary to the Bulletins of 

 Populär Information issued from the same institution, and intended 

 for the prompt publication of Information about trees and shrubs 

 collected at the Arboretum. Trelease. 



Barden. A., The ecologic subterranean anatomy ofsome 

 plants of a prairie province in central Iowa. (Amer. 

 Jour. Bot. VI. p. 87—105. Pls. 14. March 1919.) 



The anatomy of the subterranean organs of fifteen upland 

 plants and eleven alluvial basin plants have been studied and de- 

 scribed, the descriptions being made nearly uniform. There is a 

 tendency to an increase in the relative amount of mechanical tissue 

 and a decrease in the relative amount of parenchymatous tissue 

 with an increase in aridity of habitat. W. B. McDougall. 



Dorety, H. A., Embryo and Seedling of Dioon spinulosum. 

 (Bot. Gaz. LXV1I. PI. 10, 11. p. 251-257. March, 1919.) 



The cotyledons are 2 to 4 and often divided. They are multi- 

 fascicular. The vascular Strands of the different members follow 

 closely the general cycad arrangement and orientation. The size of 

 the stem makes possible a demonstration of the girdling habit. 

 Each node of the stem is telescoped within the older one instead 



Botan.CentiaJbl.au. Band Hl. 1919. 17 



