340 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the distribution is specially influenced by vertical currents. Further 

 details on these questions are promised. 



Diatoms of Germany.* — H. von Schonfeldt publishes a complete 

 work on the Diatoms of Germany, both fresh-water and marine. His 

 book is divided into two sections, a general and a special part. In the 

 former the author deals with the habitat, manner of collecting, treatment 

 of material at home, preparation for the Microscope, and the drawing of 

 specimens. He then goes on to speak of the structure and life-history 

 of Diatoms, under the headings of Structure of the diatom-cell ; cell-wall 5 

 raphe ; symmetry of the frustules ; cell-contents, including protoplasm; 

 nucleus ; centrosome, chi'omosomes, etc. ; gelatinous sheath, including 

 pores, colonies, stem-formation, etc. ; movements of diatoms ; reproduc- 

 tion by cell-formation and auxospores ; exit of new individuals from the 

 perizonium ; the various forms of spores produced and tenacity of life. 

 Fixing media and reagents are also dealt with here. The special part 

 of the book opens with keys to the families, genera, and sub-genera, and 

 then goes on to a description of each species, giving also references to 

 literature and plates previously published. Then follow a complete Ust 

 of the important literature on the subject, and indices to each part of 

 the present work. The book is illustrated l^y more than 400 figures on 

 19 plates. 



FosLiE, M., & M. A. Howe — Two New Coralline Algae from Culebra, Porto Eico. 

 [The algae in question are Guniolithon acrqpetum and Lithophyllwrn 

 antillaruvi, the latter being a reef-builder.] 



Bull. Torrey Bot. Club, xxxiii. (1906) pp. 577-80 (2 pis.). 



Kawakami, T. — List of Plants collected in Agincourt Island, Formosa. 



[Contains 23 algse, one of which is a new Codium, without description. 

 Japanese text.] Tokyo Bot. Mag., xx. (1906) pp. 199, 200. 



Mangin, a. — Distribution des algues: algues fixees, algues du plankton. (Distri- 

 bution of algae : fixed species and plankton.) 



Bull. Mus. OciMwgr. (Monaco, 1906) 33 pp. 



Pali BINE, J. — La microflore de la mer de Barents et de ses glaces. (The micro- 

 flora of the Barents Sea and of its ice.) 



[An account of modern knowledge concerning marine phytoplankton in 

 general, and researches in the Arctic regions in particidar.] 



Bull. Jard. Imp. Bot. St. FHersbourg, vi. (1906) pp. 159-83. 



Fungi. 

 (By A. LoRRAiN Smith, F.L.S.) 



Two Species of Peronospora.t — Alberto Noelli has examined the 

 forms of Peronospora that occur on Chenopodium, Spinacia, Atriplex, 

 Polygonum, etc. It had been held by Laubert that the form that grew 

 on spinach was a different species, and that the proximity of diseased 

 plants of the other genera was not a source of danger. Noelli found 

 Chenopodium and spinach growing together, and both attacked by 

 Peronospora. He examined the fungus and found such slight 

 morphological differences that one might be a variety of the other. 

 P. Spinacice is evidently the same as P. effusa. 



* Diatomacefe Germanise. Berlin : W. Junk, 1907, 263 pp., 19 pis., 456 figs, 

 t Malpighia, xx. (1906) pp. 406-8. 



