72 SUMMARY OF CURRENT RESEARCHES RELATING TO 



waters. He believes that further investigation will show a still greater 

 number of species common to both regions. 



Fresh-water Algae of Sweden. — 0. Borge* pubUshes a list of the 

 fresh-water algae of Sweden. It includes 44 species new to Sweden, and 

 nine species and varieties new to science. 



The same author t publishes also a list of algge from Argentina and 

 Bolivia, collected by R. Fries and G. 0. Malme, which contains no 

 novelties. There are a few text figures. 



Fresh-water Alg-ae of Victoria.| — A. D. Hardy brings the fresh- 

 water algal flora of Mctoria up to date, omitting the Bacillarieffi ; and 

 he publishes four new species, as well as some new records for 

 Victoria. A number of Desmids are included supplementary to the list 

 of 156 species and varieties already enumerated in the author's previous 

 account of the Victorian Desmidiaceae. The novelties are described by 

 G. S. West, including a new zygospore for Fleurotmnium ovatum Nordst. 

 var. tumidum Mask. Finally, a short list is given of new localities for 

 eighteen species of Desmids already recorded from Victoria. 



Desmidese of Central Europe.§ — ^W. Migula continues his account 

 of the cryptogams in Thome's " Flora von Deutschland," being at present 

 engaged in the exposition of the Desmideae. He supplies descriptions 

 of the genera and species ranged between C'losfermin and Arthrodesmus, 

 the space in four parts of the work being chiefly occupied by Cosmarium 

 with more than 200 species. To these, as to the species of other genera, 

 a dichotomous key is provided, and there are numerous figures. 



Fossil Diatoms. II — P. Maury having completed his investigations 

 into the pliocene vegetation of the volcanic region of Cantal, has made 

 researches in the valley of the Veronne, and finds at La Garde a rich 

 stratum of Diatomacefe. These have been examined by Frere H(^ribaud 

 who points out the identity of this flora with the diatomaceous floras of 

 Joursac, Moissac and other localities of the Cantal region already studied 

 by him. He describes besides seven new species but gives no figures. 



Spores of Diatoms.lF — H. Peragallo redescribes in detail the forma- 

 tion of spores in diatoms : the formation of sporangia, development of 

 the spores which become smaller and smaller by subdivision into two, 

 their progressive stages, transformation into zoospores within the mother 

 cell, and finally the dehiscence of the sporangium and the escape of the 

 zoospores. 



Dunaliella.** — E. C. Teodoresco publishes further observations on 

 the morphology and biology of this genus, thereby completing his study 

 of its development. His remarks are arranged under the following 

 headings : — Changes in external form ; Internal structure : Cell division ; 



* Arkiv f. Botanik, vi. No. 1 (1906) pp. 1-98 (3 pis.), 

 t Op. cit., No. 4 (1906) pp. 1-13 (figs, in text), 

 t Victorian Naturalist, xxiii. (1906) pp. 18-22, 33-42. 

 § Gera : Zezscliwitz, 1906, lief, 31-4, pp. 385-512 (20 pis.). 

 II Revue de la Haute-Auvergne, 1906, 49 pp. 



^ Soc. Sci. d'Arcachon Stat. Biol., viii. (1904-5, appeared in 1906) pp. 127-44. 

 ** Rev. Gen. de Bot., xviii. (1906) pp. 353-71. 



