Physiologie. — Algae. 297 



6. Starch is accumulated in the leaves and parenchymatous 

 tissues, except in the succulent Kalanchoe. 



7. Tannin and calcium Oxalate are less abundant then in 

 the normal plants in which they occur. 



8. No alteration could be detected in the roots. Vines. 



Percival, J., The Occurrence of Calcium Oxalate 

 Crystals in Seedlings of Alsike {Trifolium liybridam). 

 (Journ. Linn. Soc. Botany. Vol. XXXV. No. 245. July 

 1902. p. 396—402.) 



Seeds were germinated on pure filter-paper moistened with 

 distilled water. The crystals first appear throughout the whole 

 length of the petioles of the cotyledons. They then make their 

 appearance near the edges of the folded first foliage-leaf, and 

 are developed successively along the vascular bundles towards 

 the midrib, and then in the petiole. 



The formation of the crystals is not dependent upon carbon- 

 assimilation: for it took place in seedlings grown in an atmo- 

 sphere free from CO*, in seedlings grown in darkness, and in 

 others in which the blade of the first leaf had been removed. 

 Crystals were formed more abundantly when transpiration was 

 active and the water-supply sufficient. No crystals were formed 

 when calcium was not given to the seedlings. 



The crystals are formed in the cells adjacent to the bast- 

 fibres of the bundles in the petiole; and in the lamina in those 

 adjacent to both bast and wood. They adhere to the wall 

 abutting upon the fibres. It appears that the formation of the 

 crystals is connected with the development of the fibres. 



Vines. 



Ostenfeld, C. H., Phytoplankton fra det Kaspisk Hav. 

 (Phytoplankton from the Caspian Sea.) (Vedens- 

 kabelige Meddelelser fra den naturhistorishe Forening in 

 Köbenhavn. 1901. p. 129—139. Mit 10 Figurgruppen im 

 Text.) 

 Auf der dänischen Expedition nach Central-Asien sammelte 

 Herr Ove Paulsen drei Planktonproben im Kaspischen Meere. 

 Dieselben waren sehr interessant, theils weil bisher gar nichts 

 über das kaspische Plankton bekannt war, theils weil es sich 

 herausstellte, dass das Plankton mit dem der Ostsee am meisten 

 verwandt war, doch aber endemische Arten als Hauptbestand- 

 teil aufwies. 



Verf. giebt nun ein Verzeichniss der in den Proben ent- 

 haltenen pflanzlichen Organismen und erwähnt auch die reprä- 

 sentirten Thiergruppen; bei jeder Art wird in der üblichen 

 Weise die Frequenz derselben geschätzt. Als neu werden 

 folgende Formen englisch beschrieben und meistens auch ab- 

 gebildet: 



Tintinnode a: Amphorella borealis var. caspica n. var. Peri- 

 diniale s : Diplopsalis caspica n. sp., Gonyaulax Clevei n. sp., Exuviella 



