612 Algae. 



mediaires. D. Listes planktoniques pour l'annee 1907 — 1908. 

 (Copenhague, A. F. Host & fils, 72 pp. 1909.) 



The lists from plankton investigations carried out b}^ the states 

 participating in the International Studj^ of the Sea have been pu- 

 blished previously together with the hydrographical results in a 

 Bulletin issued four times a year, but now the plankton lists appear 

 as a special volume for a whole year. 



The present volume contains the plankton lists for August and 

 November 1907, February and May 1908. The area from which the 

 plankton hauls have been collected is the usual, extending from the 

 Gulf of Bothnia in the East to the Atlantic Coast of Ireland 

 in theWest, and from the Norwegian Sea (the Farö-Shetland 

 Channel) in the North to the English Channel in the South. 

 The States from which the contributions have come, are Finland, 

 Den mark, Germany, Belgium, England, Scotland and 

 Ireland. 



The Classification, arrangement etc. are as in the former plankton 

 tables published by the International Council for the Investigation of 

 the Sea, — see earlier reviews in Bot. Centralbl. C. H. Ostenfeld. 



Baker, S. M., On the cause softhezoningofbrownsea- 

 weeds on the seashore. (New Phytol. VIII. June 1909. p. 196 — 

 202. figs. 27-30.) 



This paper is a contribution to our knowledge of the conditions 

 which determine the zonal growth of algae between tidelimits. 

 Experiments were carried out near Bembridge in the Isle of 

 Wight, a set of measurements being taken to find out the vertical 

 distribution of the plants in relation to the tides. The methods of 

 work are described and a table is given shewing the Upper and 

 lower limits and mean reading of five species, as well as of the La- 

 minarias. The author mentions three phases of the life history of the 

 plant, which may be influenced by drying, viz: 1. Germination of 

 the Zygote. 2. Vegetative growth. 3. Reproduction and dispersal of 

 the gametes. Experiments were also made by growing certain spe- 

 cies in jars of sea-water and the plants which survived are here 

 represented by photography. From the way in which the sea-weeds 

 grew the author draws the following conclusions: 1. That the species 

 of sea-weeds growine high up on the shore have a power of resisting 

 desiccation, which is not possessed by those growing lower down, 

 and that this power decreases regularly in those species growing 

 towards the lower levels. 2. That the sea-weeds which can best 

 resist desiccation grow most slowly, and those that grow most 

 quickly are the least tolerant of desiccation. In the lower zones the 

 primary factor is probably rate of growth. In the upper zones the 

 determining factor is tolerance of desiccation. Other possible factors 

 are also suggested. E. S. Gepp. 



Cotton, A. D., Notes on New Zealand Marine Algae. (Bull. 

 Mise. Inf. Roy. Bot. Gardens, Kew. VI. p. 239—243. 1909.) 



Critical notes on the following species: Myrionema strangidans 

 Grev., Lecithesia dijformis Aresch. and Petrospongium Berkeleyi 

 Naeg. , Diciyota ocellata J. Ag. , CaUopliyllis Homhvoniana Kutz., 

 Chrysymenia nsperata Cotton (=r CallophylUs asperata Harv. and 



