Morphologie, Teratologie, Befruchtung, Cytologie. 531 



wandert allmählich nach dem entgegengesetzten Ende der Zelle und 

 nun bildet sich zwischen beiden die Spindel. 



Die Trennung der Mutterzellen in die beiden Spermatiden kann 

 quer oder diagonal verlaufen; das scheint im Gegensatz zu den 

 Verhältnissen bei den Lebermoosen ziemlich gleichgiltig zu sein. 



Die Entwicklung der Spermatiden zu den reifen Spermatozoiden 

 wird von Verf. nicht mehr geschildert. 



In einer interessanten Discussion erörtert Verf. noch am Schluss 

 seiner Abhandlung die Organisation der Zellen, die Bedeutung 

 der Kinetosomen und Blepharoplasten, welche er mit anderen ki- 

 noplasmatischen Strukturen vergleicht und fasst endlich einige 

 Eigentümlichkeiten der Mitosen bei den Bryophyten zusammen. Ref. 

 möchte hierauf indes an dieser Stelle nur verwiesen haben. 



G. Tischler (Braunsweig). 



Benson, M., Root Parasitism in Exocarpus (with compara- 

 tive Notes on the Haustoria of Thesium). (Ann. Bot. XXIV. 

 p. 667-677. 1 PI. 4 Fig. Oct. 1910.) 



Innumerable haustoria varying much in size and form were 

 found on the roots of various species of Exocarpus (collected in 

 New South Wales); they were anatomically examined and com- 

 pared with those on Thesium (from Switzerland). 



The haustoria contained a large number of phloeotracheides 

 i. e. vascular elements combining the structure and function of 

 phloem and xylem. These elements occur in the form of a flask- 

 shaped sheath round a central hyaline core, and it is suggested 

 that they act as a filter (separating surplus carbohydrate) between 

 the host and the mother root. 



In other Santalaceae the phloeotracheides occur in two bands 

 in the haustoria. E. de Fraine. 



Brooks, F. T. and W. Stiles. The Structure of Podocarpus 

 spinulosus (Smith) R. Br.). (Ann. Bot. XXIV. p. 305—318. 1 pl. 

 April 1910.) 



The authors describe the structure of the stem and leaf , which 

 is similar to that of the other species, and give an account of the 

 reproductive organs. 



The microsporangium resembles that of Saxegothaea and Arau- 

 caria, but the line of dehiscence is oblique, and the pollen grains. 

 as in other Podocarpeae, have several prothallial cells. 



Details are given with regard to the course of the vascular 

 bundles in the female fructification; the "cone" condition of Saxe- 

 gothaea is regarded as primitive for the Podocarpeae and from it 

 the solitary or paired megasporophylls of Podocarpus are derived. 



The relationships of the Podocarpeae are discussed, the family 

 is regarded as a natural group with no very definite connexions 

 with the Taxeae, though Phyllocladus may form a connecting link. 

 Saxegothaea may relate the Podocarpeae with the Araucarieae, but 

 there is no evident relationship with the Abietineae. 



E. de Fraine. 



Kubik, A., Ueber die Umbildung des Blütenstieles zum 

 Fruchtstiel. (Berner Dissertation. 123 pp. 3 Taf. 1911.) 



Verf. hat an 16 Pflanzen die Entwicklung des Blütenstieles zum 



