Bd. XCVI. Nr. 12. XXV. Jahrgang. 



Botanisches Centralblatt. 



Referirendes Organ 



der 



Association Internationale des Botanistes 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten: des Vice-Präsidenten : des Secretärs : 



Prof. Dr. K. Goebel. Prof. Dr. F. 0. Bower. Dr. J. P. Lotsy. 



und der Redactions-Commissions-Mitglieder: 



Prof. Dr. Ch. Flahault und Dr. Wm. Trelease. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. LotSy, Chefredacteur 



v, 50 Abonnement für das halbe Jabr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1904, 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

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



Leavitt, ROBERT G., Trichomes of the Root in Vascular 

 Cryptogams and Angiosperms. (Proceedings of the 

 Boston Society of Natural History. Vol. XXXI. No. 7. 

 p. 273—313.) 



The writer distinguishes the root-hair producing cells of 

 the piliferous layer into two types, viz., unspecialized hair-cells 

 and trichoblasts. In the first type the hair may originate from 

 any cell of the piliferous layer, while in the latter the hair pro- 

 ducing cell is distinguished as a short richly protoplasmic cell 

 at an early stage of development. Trichoblastic root-hairs are 

 found in the Schlzeaceae, in Equisetiim, in Azolla, in Lyco- 

 podium, in Phylloglossiim, in Isoetes and in Selaginella among 

 the Pteridophyta. In the Monocotyledons they occur in the 

 Helobleae, most Gluml/lorae, some Spadiciflorae, the Enantlo- 

 hlasteae, several Orders of the Scitamineae, and Gynandrae. 

 They are also found among the Dicotyledons in some of the 

 Nymphaeaceae. The unspecialized type of hair-cell is present 

 in most Dicotyledons, in many of the Filicales, and in some 

 Monocotyledons (Certain of the Glumiflorae, Spadiciflorae, 

 Liliflorae and Gynandrae). E. C. Jeffrey. 



Kearney, T. H., ArePlants of Sea Beaches and Dunes 

 true Halophytes? (Bot. Gaz. Vol. XXXVII. p. 424—436. 

 june 1904.) 



Observations on the salt content of beach and dune soils 

 in three Iocalities (in Mass achusett s , Virgin ia, andCali- 



Botan. Centralbl. Bd. XCVI. 1904 19 



