Band 134. Nr. 15. XXXVIII. Jahrgang. I. Bd. Nr. 15. 



Botanisclies 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. Gotton, 



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



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 15. 



Abonnement für das halbe Jahr 15 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1917. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

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



Barratt, K., The origion of the endodermis in the stem 

 of Hippuris. (Ann. Bot. XXX. p. 91—99. 6 text-figs. 1916.) 



The fact that in the adult organs the innermost layer of the 

 parenchymatous tissue surrounding the central cylinder is frequently 

 differentiated by special characters has given to this layer, the 

 endodermis, a special significance. The reason that it has acquired 

 so much importance is that it has generally been regarded as the 

 innermost layer of the cortex and developed from the innermost 

 layer of the periblem, forming thus the boundary of the stele. The 

 importance of the endodermis as a morphological unitthus obviously 

 depends on the uniformity of its mode of origin. This was realized 

 by J. C. Seh oute, who in 1902 published a general review of the 

 stelar theory (Die Stelar-Theorie, Groningen). Among the plants 

 which he examin ed was Hippuris vulgaris and in this case his 

 investigations led him to the conclusion that not only the endoder- 

 mis but several other layers of the cortex were derived from the 

 plerome. This conclusion was directly opposed to Sanio's view 

 (Ueber endogene Gefässbündelbildung. Bot. Zeit. Jahrg. XXII, 1864) 

 according to which the endodermis was derived from the innermost 

 periblem layer. 



The present author has reexamined Hippuris in detail and her 

 resultsagree with those of Schonte and are opposed tothose of Sanio, 

 since she finds that normally three layers of the inner cortex inclu- 

 ding the endodermis, take their origin from the outer plerome. 



Incidentally the author traces the origin of the cortical lacunae 

 in Hippuris vulgaris. Agnes Arber (Cambridge). 



Botan. Centralblatt. Band 134. 1917. 15 



