Algae. — Eumycetes. 299 



Mc. Farland, F., The Kelps of the Central Californian 

 Coast. (Appendix M. Fertilizer Resources of the United States 

 Senate Document No. 190, 62e Congress, 2e Session, p. 194—208. 

 1911.) 



The author divides the Pacific coast of America into four 

 well-marked regions of algal growth viz., the tropical region 

 extending as far north as Magdalena Bay, Lower California, 

 the subtropical region extending north to Point Conception, 

 the north temperate region extending to Puget Sound and the 

 boreal region extending northwards. The paper deals with the 

 algae of the northtemperate region of the coast of northern and 

 central California. Valuable colored maps of distribution accom- 

 pany this appendix. Harshberger. 



O verton, J. B., Artificial Parthenogenesis in Fucus. (Science. 

 XXVTI. p. 841—844. 1913.) 



Overton worked at Woods Hole, Mass., with Fiiciis vesicu- 

 losus. Each collection of plants was washed with fresh water to 

 kill any sperms which might adhere, and was then divided into 

 three lots. One lot was fertilized normally, another was allowed to 

 remain in sea water, and the third lot was treated with acetic or 

 butyric acid. The net results were that the first lot always developed 

 normal sporelings; the second lot did not develop at all; but the 

 third lot, under the artificial Stimulation, developed sporelings 

 which appeared to be normal. These sporelings developed up to 

 the 25 cell stage, but the experiment was not carried farther. No 

 cytological work was done. Since the Fticiis plant is the diploid 

 generation, it would be interesting to know the nuclear conditions 

 in the sporelings, especially if they should develop up to the repro- 

 ductive phase. Charles J. Chamberlain (Chicago). 



Setehell, W. A., The Kelps of the United States and 

 Alaska. (App. K. Fertilizer Resources Un. Stat. Senate Document 

 NO. 190, 62d Congress 2d Session, p. 130—175. 1911.) 



As part of this valuable and voluminous report, Setehell gives 

 account of the morphology and Classification of the brown sea 

 weeds with notes on their geographic distribution. He describes 

 the relation of bathymetric zones, relation of the substratum, rela- 

 tion of the salinity of the water, relation of temperature, light and 

 air to their distribution, also duration of life and seasons. 



Harshberger. 



to' 



Poeteren, N. van. De overwintering en bestrijding van 

 eenige meeldauwzwammen. [Die Ueberwinterung und 

 Bekämpfung einiger Mehltaupilze.] (Tijdschr. over Plantenz. 

 XVHI. p. 85—95. 1913.) 



Verf. bespricht kurz die Bedeutung der beiden Mehltaupilze: 

 Oidiuin quercinum Thümen (= Microsphaera alphitoides Griff, et 

 Maubl.?) und Podosphaera leucotricha Ell. et Everh., der Eichen - 

 und Apfelmehltau also. Seine Wahrnemungen. in den Jahren 1911 

 und 1912 gemacht, bestätigen ungefähr die Resultate Negers, 

 der die Unzulänglichkeit der Konidien für Ueberwinterung der 

 Eichenmehltau zeigte und als Centrum des Neuauftretens fand 



