Algae 467 



den höheren Pflanzen, die Chromosomen der zweiten Spindel 

 sind auffallend verschieden von denen der ersten. 



Jeder Kerntheilung in der Zygote folgt auch eine Zell- 

 theilung; die Zellwand wird innerhalb einer Kernplatte angelegt. 



Eine besondere Sporophyten Generation fehlt Coleochaete 

 also noch; zwischen Befruchtung und Chromosomenreduction 

 ist kein weiteres Stadium eingeschaltet. So weit wir aus der 

 vorhandenen Literatur Schlüsse ziehen dürfen, scheint ähnliches 

 wie bei Coleochaete bei den Desmldiaceen, Spirogyra und Oedo- 

 goniiim vorzukommen. Ob auch die Characeen sich hier an- 

 schliessen, ist noch nicht festgestellt, aber nicht unwahrschein- 

 lich, da hier gleich jenen eine Chromosomenreduction vor 

 der Bildung der Gameten unterbleibt. 



Dagegen dürften bei den Dictyotaceen, Phaeophyceen, Flori- 

 deen und Diatomeen schon Anfänge einer Trennung in Spoio- 

 und Gametophyten-Generaiion vorhanden sein. 



Tischler (Heidelberg). 



Holmes, E. M., Some South Orkney Algae. (Journal of 



Botany. XLIII. July 1905. p. 196—198.) 



This list includes the four species of calcareous algae collected by 

 the Scottish National Antarctic Expediton at South Orkneys, as well 

 as six records of fragmentary algae found adhering to these. Among 

 these is included Cryptonemia luxurlans, which through previously 

 recorded by J. G. Agardh from South Polarregions had never 

 been verified. Petrocelis cruenta is also included as a novelty for the 

 Antarctic Ocean. Two of the calcareous algae are apparently 

 only known from the South Orkneys and have been described as new 

 by M. Foslie. E. S. Gepp-Barton. 



JÖRGENSEN, E., Protist-Plankton, in: 0. Nordgaard, 

 H y dr ogra p h ical and Biological In vest igations in 

 Norwegian Fiords. (Bergens Museums Skrifter, Bergen 

 1905, Folio, p. 49—113, 146—151 (p. 114—145 contain 

 Protozoa). PI. VI— VIII.) 



This paper is very important with regard to the marine 

 plankton investigations; it deals with the plankton of the N.W. 

 part of the coast of Norway. The material has been col- 

 lected in 1899 and 1900. 



The paper contains the following parts : 



1. Plankton tables (p. 50—86), The organisms found 

 in the plankton samples examined are arranged in tables in 

 which the locality, the date of collecting, the depth, the salinity, 

 the temperature and the more or less common occurrence of 

 the observed species are given. 



2. General remarks on the plankton (p. 87—90). 

 The author states that the most striking circumstance of the 

 plankton is the evolution of large masses of diatoms which 

 take place early in the spring: he names it „the inflow of 

 diatoms". When trying to give an explanation of this pheno- 

 menon he criticises the views on the plankton set forth by 



30* 



