744 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Phytoplankton of Lakes in the Faeroes.* — F. Borgesen and C. EL 

 Ostenfeld have investigated certain lakes in these islands and give a list 

 of the phytoplankton found in them. The species are enumerated in 

 two tables, one containing the species recorded from Sorvaagsvatn at 

 different times, and the other containing all the species recorded from 

 eight different lakes. The authors regard the result of their investi- 

 gations as very poor. Certain species of desmids and other Chloro- 

 phycere, as well as the diatom Cyclotella were often found to be sur- 

 rounded by a mucilaginous envelope. Special notes and remarks are 

 made on certain species, including one new to science, Staurastrum 

 Magdaleiw. 



Japanese Marine Algse.f — K. Okamura has issued a second fasciculus 

 of the algae of Japan, and he publishes a list of them in which he 

 describes the new species and varieties. The new species are Cylin- 

 drocarpus rugosa and Chcetomorpha spiralis. Some alterations are made 

 in the nomenclature of other species, the reasons for which are stated. 



New Genera of Diatoms.} — C. Mereschkowsky describes two new 

 genera, Placoneis and Staurophora. The former is composed of species 

 which have till now been included in the genera Pinnularia, 

 Naviada, and Stauroneis. The internal structure of these species 

 differs however from that of the genera in which they had been placed,. 

 and they are accordingly placed in the two new genera. Their principal 

 characteristic lies in the combination of a symmetrical structure and form 

 of the frustules with a single asymmetrical endochrome body. Each 

 species of the new genera is treated separately, and synonomy, description t 

 and geographical distribution are given, often followed by critical notes. 

 In remarks on the relationships of the two new genera, a list is given of 

 the species of Naviada which have to be removed to Placoneis and 

 Staurophora, as well as a table of descent connecting species of Cymbella 

 with Placoneis dicephala. The author regards Placoneis as the missing 

 link between symmetrical and asymmetrical Pyrenophoreae, the latter 

 being descended from the former. Finally a key is given to the genera 

 of the Pyrenophoreae, and a list of the groups and species of Naviada 

 which must be excluded from that genus, together with their new and 

 correct designations. 



Diatoms from Morocco.§ — E. Belloc gives a list of 97 species and 

 17 varieties gathered principally at Mogador and Tangier. The genera 

 represented are 32. Navicvla contains the greatest number of species, 

 38 ; followed by Amphora with 19. There are no novelties. 



C h a p m a n, F., & H. J. Gkatso n— On " Red Rain," with special reference to its 

 occurrence in Victoria. 



[Includes a list of Diatomacese in the sediment collected at St. Kilda on 

 March 28th, 1903.] Victorian Naturalist, xx. (1903) pp. 17-32 (2 pis.). 



* Botany of the Faeroes, ii. (1993) pp. 613-24 (4 figs.), 

 t Bot. Mag. Tokyo, xvii. (1903) pp. 129-32. 



% Beih. Bot. Centralbl., xv. (1903) pp. 1-30 (1 pi. and 14 figs, in text). 

 § Compt. Kend. Cong. Soc. Savantes, 1903, pp. 143-50. See also Bot. Centralbl., 

 xciii. (1903) p. 301. 



