Band 101. Nr. 4. XXVII. Jahrp^ang. 



Botanisches Centralblatt. 



ßeferirendes Organ 



der 



Association Internationale des Botanistes 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice-Präsidenten: des Secretärs : 



Prof. Dr. R. v. Wettstein. Prof. Dr. Ch. Flahault. Dr. J. P. Lotsy. 



und des Redactions-Commissions-Mitglieds : 



Prof. Dr. Wm. Trelease. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



No. 4. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1906. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

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



Jones, C. E. , The Morphology and Anatomy of the 

 Stern of the Genus Lycopodiiim. (Trans. Linn. Soc. Lond. 

 Ser. 2. VoL VII. Part 2. p. 15. 1905.) 



About twenty different species are dealt with in detail, and 

 in addition a füll account is given of the structure of the seed- 

 ling plant of Lycopodiiim clavatiim. Young plants of L. selago 

 and L. serratiim that have arisen from the bulbils are also de- 

 scribed. 



The author recognizes two types of structure in the vas- 

 cular System of the mature stem of the Lycopodiiims : a, Those 

 that exhibit a series of alternating bands of xylem and phloem. 

 b. Those in which the phloem is scattered through the mass 

 of xylem in more or less isolated patches, The first type is 

 developed in creeping stems, the second is characteristic of 

 tropica! epiphytes. The disposition of the xylem and phloem 

 Strands throughout the transverse section of the stele constantly 

 alters as you pass up or down the stem. 



The young stem of the seedling of L. clavatiim is radially 

 Symmetrie, and in its eariy stages contains a triarch or tetrarch 

 xylem Strand the metaxylem of which occupies the centre of 

 the stele. Later on. when the number of protoxylems has in- 

 creased to five or six, the phloem differentiates in bands rca- 

 ching from one side of the stele to the other. 



The branching is monopodial or dichotomous. The former 

 is commonly found in creeping species and some erect speci- 

 mens. The latter occurs frequently in the vegetative shoots of 

 epiphytes and just below the strobilar regions of various spe- 



Botan. Centralbl. Band 101. 1906 Ö 



