Band 104. Nr. 6. XXVIII. Jahrgang. I. Bd. Nr. 6. 



Botanisches Ceiitralblatt. 



Referirendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 



des Präsidenten : des Vice- Prä sidenteti : des Secretärs : 



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



tind der Redactions-Commissions- Mitglieder : 



Prof. Dr. Wm. Trelease und Dr. R. Pampanini. 



von zahlreichen Speciah^edacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



^ „ Abonnement für das halbe Jahr 14 Mark | ^q^« 



i>0. b. , (iurch alle Buchhandlungen und Postanstalten. j ^^'* 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

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



Bergen, J. Y. and M. D. Davis. Principles ofBotany. (Ginn & C*^., 

 Boston. 1906. 8^^. LX + 555 pp. 402 figs.). 



A textbook, designed to take the place of Bergen's "Foundations 

 of Botan}^" from which it differs by the Omission of the Flora, 

 though retaining approximately the same volume. This is chiefly due 

 to the ample treatment of the spore-plants, with especial reference 

 to Evolution. Much Space has also been devoted to a judicious treat- 

 ment of Ecolog3' and Economic Botany. The chapters on Variation 

 and Plantbreeding call the attention of the Student to recent develop- 

 ment along these lines. Many new and excellent illustrations entrance 

 the value of this buok, buth for the pupil and the teacher. 



H. Hus. 



A. R. The Absence ofan Epidermis in the Roots ofMono- 

 cotyledons. (New PhA'tologist. Vol. V. 1906. p. 97—98). 



The Monocotyledons are characterised by the absence of an 

 epidermis in their roots, and many of them, particularly in the 

 Liliißoreae , contain a mj'corhiza. The Liliifloreae have been consi- 

 dered to be the most primitive of the Monocotj'ledons, having been 

 evolved from Dicotyledons through the adoption of geophj^tic mode 

 of life. Many of them belong to Stahl's class of weakl}^ transpiring 

 sugar-leaved plants; the geophytic habit also renders absorbtion ol' 

 salts difficult. This difficult}^ has been obviated by the symbiotic 

 Union with a Fungus. It is suggested that the absence of an epider- 

 mis may conceivably facilitate the entrance of the Fungus and that 

 this character might possibly have been evolved in connexion with 



Botan. Centralblatt. Band 104. 1907. 10 



