76 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Waknbtorf, C. — Laubmoose. (Mosses.) 



Kryptogamenflora der Mark Brandenlturg. Abt. I., Band ii., 



pp. 241-432, Leipzig, 1904 (fi^a.)- 



Yoshinaga, J. — Hepaticae and Fungi around the Marine Biological Station at 

 Misaki. 



[List including 12 liepatics.] Bot. Mag. Tokyo, xviii. (1904) pp. 216-217. 



Thallophyta. 



Algae. 



Morphology and Biology of Algae.* — F. Oltmanns publishes the 

 first volume of his great work under the above title. This volume 

 consists of a treatment of the separate families under nine different 

 groups : I. Chrysornonadineae. II. Heterocontas. III. Cryptomona- 

 dineae. IV. Euglenaceas. V. Dinoflagellata. VI. Acontae. VII. Chloro- 

 phyceae. VIII. Phaaophyceas. IX. Rhodophyceae. The author omits 

 Cyanophyceas, as he holds that that group is too closely related to- 

 Bacteria to be considered apart from such genera as Cladoihrix, Beggiatoa, 

 etc. On the other hand he includes Charales and the coloured Flagellata j 

 the latter group being in his opinion an essential part of any treatment 

 of algaa, since the Flagellata are becoming more and more regarded as. 

 the ancestors of the algaa. Bangiales are inserted between Phasophyceae 

 and Rhodophyceas. The arrangement of the Orders is in some cases 

 different from that usually accepted. The treatment of Rhodophyceae 

 is divided into two sections : (1) Structure of the vegetative organs ^ 

 and (2) Reproduction. The different Orders are dealt with separately 

 from these two points of view. The book is well illustrated by new 

 and old figures. 



Behaviour of Marine Algae in Relation to Salinity.! — K. Techet 

 continues the publication of his observations on this subject. He says 

 that the individual power of accommodation to changes of salinity in 

 marine alga? is very large, and he gives instances of extremes in which 

 various species could live. Cladophora trichotoma can bear water vary- 

 ing between 1 ■ 8 p.c. and 8 " 5 p.c. When the salinity was raised to 

 13 "2 p.c, the plant produced plentiful swarm-spores and perished. 

 Other algae of which statistics are given are : Ghcetomorpha aerea, Ecto- 

 carpus sp., and Peyssonellia Bubyi. As examples of the power of 

 certain algae to accommodate themselves to varied salinity, the author 

 mentions the small rock-pools along the coast, where algae are subjected 

 to the access of sea or rain-water, as well as to considerable concentra- 

 tion on hot, dry days, at neap tides. The inhabitants of such pools 

 consist mainly of Cyanophyceae. 



Sphacelariaceae.J — C. Sauvageau publishes the second fascicle of 

 his remarks on the Sphacelariaceae, some of the separate parts of which 



* Morphologie und Biologie der Algen, i., pp. vi., 733, 3 coloured and 473 plain 

 figs, in text. G. Fischer. Jena. 1904. 



+ Oesterr. Bot. Zeitschr., liv.(1904) pp. 367-73. 



t Remarques sur les Sphacelariacese. fasc. ii. (1904). Republished from Journal 

 de Botanique, 1902-1904. 



