326 SUMMARY OF CURRENT RESEARCHES RELATING TO 



based upon data obtained from German friends of the deceased bryo- 

 logist ; and adds a list of his three principal works and thirty-eight 

 shorter papers on Muscineae. 



Thallophyta. 

 Algae. 



British Fresh-water Algae.* — Messrs. W. and G. S. West publish 

 a list of 94 fresh-water alga? from various parts of England, including 

 thirty from the Scilly Islands, the first records from that part. Three 

 new genera are described, PhcBosphcera, Pseudocode, and Polychodophora, 

 containing one new species each, and, excluding these, the authors de- 

 scribe also other ten new species. Of these the most interesting is 

 Debarya desmidioides, which forms another link in the descent of the 

 Desrnidiaceas from the Conjugates. It is an extremely fragile plant, the 

 filaments of which break up most readily into individual cells, and con- 

 jugation only takes place between two of these isolated cells. The 

 authors consider that the origin of the genera MesoUenium and Cylindro- 

 cystis from ancestral filamentous Conjugates is clearly indicated by this 

 new species. Amended and enlarged descriptions are given of the 

 genera Chlorobotrys and Ineffigiata. 



Fresh-water Algae. t — A. Hansgirg publishes some additional notes 

 on fresh-water algae which he has collected in Bohemia, giving the 

 localities in which he found them. Some of these records are here 

 brought together and republished from other papers. Then follows a 

 list of species collected by the author in the East Indies, specimens of 

 which will be distributed in Beck's Kryptogamm exsiccate and in 

 Richter's Phycotheca universalis. The locality where each species was 

 found is given, and in many cases notes regarding size, &c. are added. 



Finally, remarks are made on the fresh -water algae of Greece and 

 Egypt, founded on collections made by the author in those countries. 



Literature on the Algal Flora of Russia 4 — An alphabetical list 

 of authors on this subject, with a short resume of the work of each, is 

 published by N. Gaidukow, and a short chronological treatment of the 

 literature is added. 



Fresh- water Algae of the Azores. § — K. Bohlin has made a study 

 of the fresh-water alga? of these islands and has himself found 158 

 species, which together with other records makes a total of 171 species 

 known from the Azores. His collections were however limited for the 

 most part to one island, they took place during only one season, and 

 that included the driest months of the year, June to August. Conse- 

 quently this list is not considered by the author as being in any way 

 exhaustive, though he believes that even further investigation will show 

 that the fresh-water flora of the Azores is a poor one. The physical 

 geography of the islands is briefly described, and general remarks are 

 made on the various habitats of fresh-water algae, lacustrine, thermal, 



* Journ. of Bot.. xli. (1903) pp. 33-41, 74-82 (3 pis.). 



+ S.B. k. liohm. Gesell. Wissensch.. xxviii. (1902) 17 pp. 



% Script. Bot.. xvii. (1901) pp. 1-123. 



■§ Bihang k. Svensk. Vet.-Akad. Haudl., xxvii. (1902) No. 4, S5 pp. (1 pi.). 



