324 SUMMAEY OF CUKRENT RESEARCHES RELATING TO 



Nuclear Division in Chlorogonium elongatum. — M. Hartmann 

 {Sitz.-her. Ges. naturf. Freunde Berlin, 1916, 9, 347-51, 20 figs. See* 

 also Bot. Centralhl., 1917, 135, 15-1). The nuclear division of 

 Chlorogonium elongatum is as follows : — The organism is slender, spindle- 

 shaped, and has a green chromatophore, with one pyrenoid before and 

 behind the nucleus. At the front end arise two cilia of equal length. 

 The nuclei are typical centronuclei with intranuclear mitosis. The 

 generative nuclear material in the resting nucleus is permanently situated 

 in the external portion ; only in the telophase may it be temporarily 

 united with the inner bodies. The locomotor-material is not as a rule 

 to be traced in the resting nucleus, though Dangeard holds that the 

 centriol is here also closely adjacent to the nuclear membrane, as is 

 found in. other protozoa and algfB. The course of division reveals the 

 presence of both nuclear components. E. S. G-. 



Fresh-water Algse of the Austrian Coast Districts. — B. Schussnig 

 {Oesterr. hot. Zeitschr., 101.5, 65, 248-52, fig. See also Bot. CentralbL, 

 1917, 135, 246). Plectonema radioswn (Sch.) wa& found thickly 

 covered with Ghamsesiphon incrustans Grun. at Gradisca. The forms of 

 Stigeodonium are so numerous as barely to merit names. S. hngipilum 

 Kiitz. shows constantly the following mode of growth : The young 

 germinating plants grow in spring on the filaments of a Gladophora, 

 which is already growing luxuriantly. In July that dies down, and the 

 Stigeodonium plantlets cover the stones, which had served as substratum 

 for the Gladophora, with a light-green velvety growth. A new species 

 of Ulothrix was found. E. S. G. 



Marine Diatoms from the Coasts of Iceland.— E. Oestrup {The 

 Botany of Iceland, edited hy L. K. Rosenvinge and E. Warming, Gopen- 

 hagen, 1916, 845-94, 1 pi.) The examination of 438 samples of material 

 yielded a list of 209 species and varieties, arranged systematically in 42 

 genera. Seven new species and four varieties are described and figured. 

 In an alphabetical table the distribution of each species is displayed in 

 parallel columns — {a) throughout the world ; (J)) in Greenland and the 

 Arctic Ocean ; (c) on the coast of Iceland. Further tables show the 

 frequency of occurrence ; also the genera and species that were found to 

 be associated with several of the larger algae — Ehodophycese, Phaeo- 

 phycefe, and Chlorophyceas. A. G. 



The Quality of " Asakusanori." — Y. Okuda and S. Nakayama 

 (Journ. Goll. Agric. Imp. Univ. ToTcyo, 1916, 5, 339-340). The ancient 

 Japanese food "Asakusanori" or " Hoshinori " is prepared from the 

 alga Porphyra tenera Kjellm. by drying, and is widely consumed. It 

 resembles black paper. The authors give a chemical analysis of it, and 

 find that the superior samples contain more nitrogen, mostly in an 

 assimilable form. A. G. 



Relation between the Chemical Constituents of " Asakusanori " 

 and its Quality. — H. Matsui {Journ. Goll. Agric. Imp. Unir. Tokyo, 

 1916, 5, 391-393). The author discusses the chemical analysis of 

 " Asakusanori " prepared from Porphyra laciniata, and states that the 



