498 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Bohemian Bacillariese.* — K. Hoffman reports on the Bacillarieae 

 of the Kieselgur and of the marshes in the Soos near Franzensbad, in 



Bohemia. The Soos marshes are all salt, except those containing 

 Utricularia, which are neutral, and are characterized by Rhopalodia 

 ventricosa O.M., Cymbella rentricosa Kiitz., and G. amphicephala Nay. 

 The occurrence of Navicala interrupta, N. limosa, N. elliptica, N. 

 tumida, and Aehnanthes subsessilis, characterize the ochreous strata. 

 The Vivianite is poor in siliceous algae. Characteristic species are : 

 Nitzschia KittUi, Anomwonis sculptu, Pinnularia viridis. Amphora Ubyca, 

 Synedra affinis, Gomphonema subclavatum var. montanum, Melosira 

 crmulata var. ambigua, and remains of Carnegia. Experiments were 

 made by the author to ascertain the adaptability of certain species to 

 marshes containing acid-free sulphate ; Nitzschia Palea won the first 

 place. Navicula hungarka was kept in the dark for over two months, 

 and still showed active movements. The great Kieselgur bed is de- 

 scribed with the characteristic species of the different depths. Cymbella 

 gastroides is wanting, and Oampylodiscus clypeus predominates. New 

 and critical forms are figured. 



Plankton Epiphytes.f — B. Schroder has made a study of the 

 organisms found living on species of plankton, for which he invents the 

 term " Planktonepibionten." Among the phytoplankton, Schizophyeeae 

 and Bacillariaceae are most frequently found to bear " epibionten," and 

 some of the " epibionten " confine their residence to one particular host- 

 species. 



Diatoms of Portugal and Mozambique.— C. ZimmermannJ publishes 

 a catalogue of the diatoms of Portugal, which includes L5 ( J species ; of 

 these fifty-one are new to the country. 



The same author § records also diatoms collected by two priests, 

 L. Lopes and M. da Fonseca, in Mozambique. The localities were the 

 rivers Nhamadri, Cathunda, on the Upper Zambesi, and in the Bons 

 Lignaes, or Zuilema, on the Lower Zambesi. The list contains seventy- 

 seven species. 



Development of Cy lindr ocy stis . |j — H. Kaufmann describes the de- 

 velopment of CyUndrocysHs. His work is divided into two parts. In the 

 first, the vegetative cell and its division is treated. The nucleo-proteid 

 nature of the nucleus is demonstrated for this class of the Conjugatae. 

 The vegetative division, which takes place principally at midnight, is 

 described in detail, as well as the division of the chromatophores, with 

 their pyrenoids. The second part of the work deals with the fertiliza- 

 tion, ripening, and germination of the zygotes. The union of the two 



* Oesterr. Bot. Zeitschr., lxiv. (1914) pp. 209-22 (2 pis.). See also Bot. 

 Centralbl., cxxvi. (1914) p. 481. 



t Biol. Centralbl., xxxiv. (1914) pp. 328-38. See also Bot. Centralbl., cxxvm. 

 (1915), p. 297. 



t Broteria, xii. Ser. Bot., 2 (Braga, 1914). 



§ Broteria, xii. Ser. Bot., 3 (Braga, 1914). See also Bot. Centralbl., cxxvm. 

 (1915) p. 267. 



|| Zeitschr. Bot., vi. (1914) pp. 721-74. See also Bot. Centralbl., cxxvm. (1915) 

 p. 344. 



