Bd.XCVIII. No. 16. Jahrgang XXVI. 



Botanisches Centralblatt. 



Referirendes Organ 



der 



Association luternationale des ßotanistes 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice-Präsidenten: des Secretärs : 



Prof. Dr. K. GoebeJ. Prof. Dr. F. 0. Bower, Dr. J. P. Lotsy. 



und der Redactions-Commissions-Mitglieder : 



Prof. Dr. eil. Ffahnult und Prof. Dr. Wm. Trelease. 



von zahlreichen Specialredaeteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



No. 16. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1905. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Rijn-en Schiekade 113. 



Drabble, Eric, On the Anatomy of the Roots of Palms. 

 (Trans. Linn. Soc. London. Series 2. Vol. VI. p. 427. 

 1904.) 



This paper gives the results of an extensive investigation 

 into the structure of the roots of Palms ; as many as sixty 

 seven species being described in the special part. In the first 

 part of the paper a general account of the anatomy and histo- 

 logy of the roots is given and also of their origin upon the 

 stem, As regards the outer tissues of the roots the limiting 

 or piliferous layer apparently never bears any root hairs. The 

 outer corticai' region^ or tegumentary System, is more or less 

 lignified. The inner cortex contains lysigenous air-spaces, and 

 lignified often thick-walled cells or fibres frequently occur in 

 it, either singly or in small groups. In some cases the Strands 

 of fibres are surrounded by stegmata. In the root apices 

 examined the meristem was found to be entirely unstratified, 

 and to consist of a common group of initial cells. 



The vascular System of the adventitious roots is brought 

 into relation with the internal as well as the external vascular 

 bundies of the stem by a number of connecting Strands which 

 are differentiated in the ground tissue of the stem. These 

 Strands may be followed externally into the young root arising 

 in the pericycle as distinct procambial Strands. In the mature 

 root these Strands fuse with each other distally, and give rise 

 to radially Symmetrie cylinders; so that in a transverse section 

 of the root just external to the pericycle of the stem the centre 

 is occupied by a number of free Strands of fibrous tissue for- 



Botan. Gentralbl. Bd. XCVIII. 1905. 26 



