ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 621 



Flora of Bremen.* — F. Hustedt continues his contributions to the 

 flora of Bremen, and describes the Bacillariaceae of the Ochthum, a 

 tributary of the Weser. He observed altogether 148 species belonging 

 to 33 genera. Comparisons are given between this flora and the species 

 previously examined by the author from a moorland canal. Critical 

 notes are added to some of the records. 



Algae of the Tatra Mountains.f — R. Gutwinski publishes a flora 

 of the algae of the Tatra mountains. His work is divided into four 

 sections, which deal with the position and character of the Tatra 

 mountains, a review of past work on the algae of the district, problems 

 concerning the algal flora of the Tatra, and a systematic enumeration of 

 species. 129 genera are recorded, and 827 species, of which 11 species 

 and 28 varieties or forms are new. These are all figured. Critical 

 remarks are also appended to some of the already known species. 



Algae of Trebizond.J— S. Stockmayer has worked out the collections 

 of marine, fresh-water, and brackish-water algas made by Handel- 

 Mazzetti in the district of Trebizond. Before enumerating the species 

 found, the author gives a resume of previous work done on the algae of 

 the Black Sea and Asia Minor, with notes on the climate, topography, 

 and geology of the region. The collections contain 60 marine species, 

 (17 fresh-water, and 5 brackish-water. Of these, 61 fresh-water species 

 are new for Asia Minor, and 8 marine for the Black Sea. Notes on 

 geographical distribution are added, and remarks on the varieties of 

 Synedra affinis. 



Black Sea Algae. § — N. N. Woronichin records a species new to the 

 Black Sea, Gastagnea mediterranea Bornet. He collected it himself in 

 an excursion to the Crimea, and found it also among Black Sea algaa in 

 Charkow University, and in the Sebastopol Biological Station. This 

 alga is peculiar in that it was growing on stones, whereas C. mediterranea 

 generally grows epiphytically. The author also examined specimens of 

 Chorda Filnm, collected in 1869 by Sperk, and in 1889 by Perejaslazew. 

 These specimens proved to be not very typical plants of Scytosiphon 

 lomentarius J. Ag., characterized by the small size of the thallus, the 

 absence of constrictions, and the more compact structure. Chorda Filum 

 must therefore be struck out of the list of Black Sea algae. 



Russian Fresh-water Algae. j| — A. A. Elenkin publishes a first con- 

 tribution concerning new, rare, or interesting species and forms of alga) 

 collected in Central Russia. He describes a new species of Anabsena, 

 A . Scfieremetievi, with varieties and forms, and also gives critical descrip- 

 tions of other species and varieties of the genus. He considers that 

 A. spiroides is very closely allied to a variety of his new species, and that 

 both these, together with A. Bergii, A. planctoniea, A.caspica, A. macro- 

 spora, A. sphserica, and probably A. Werner i, are phylogenetically allied, 

 forming a natural group, which the author designates subsection Sche- 

 remetievi. 



* Abb. Nat. Ver. Bremen, xx. (1909) pp. 91-120. 



t Bull. Internat. Acad. Sci. Cracovie. (1909) pp. 415-560. 



X Ann. k.k. Nat. Hofmus. Wien (1909) pp. 55-100. 



§ Bull. Jard. Imp. Bot. St. Petersbourg, x. (1910) pp. 78-84. 



i| Op. cit., ix. (1909) pp. 121-54. 



