636 Algae. — f'ungi, Bacteria und Pathologie. 



schliesslich viele Arten, aber diese meist nur in geringer Individuen- 

 zahl auf. In den vom Verf. untersuchten Proben aus dem 

 Indischen Ozean wurden 118 Arten, aus den japanischen Ge- 

 wässern sogar 147 Arten beobachtet. Entweder herrschen die 

 Peridiniaceen oder die Bacillarlaceen vor, niemals beobachtete Verf. 

 beide in annähernd gleicher Artenzahl. 



Ausnahmsweise kann auch im Warmwassergebiete zu gewissen 

 Zeiten ein monotones Plankton von Bacillariaceen oder von Peri- 

 diniaceen auftreten, ebenso ist ein solches aus Trichodesmium und 

 Halosphaera bestehend bekannt. Dann werden Beispiele von häu- 

 figen und teilweise charakteristischen Pflanzen des Warmwasser- 

 planktons namhaft gemacht und die durch luxurierendes Wachstum 

 ausgezeichneten Warmwasserformen der Arten, die auch im Kalt- 

 wasser vorkommen, kurz besprochen. Heering. 



Arthur, J. C. and F. H. Kerj^, North American species of 

 Peridennium. (Bull. Torrey Bot. Club. XXXIII. p. 403—438. 

 Aug. 1906.) 



No descriptive account of the Peridermiums of N o r t h A m e r i c a 

 has previously appeared, although the species have been listed in 

 several publications. The present paper describes twenty seven 

 species, a number of nQ.\N characters being used in separating them. 

 Extensive culture work alone can straighten out the present uncer- 

 tainly in nearly the whole genus. The attempt has been made to 

 connect different stages with each other. Keys are given by which 

 the Separation of species is accomplished. The following new species 

 are made : Peridermium delicaiuliim on leaves of Pinns sp. from 

 Florida, P. nwnfamini on leaves of Pinns scopnlornm and P. 

 Mnrrayana from Montana, Oregon and Washington, P. inter- 

 mediiun on leaves of Pinus echinata from Missouri, Maryland 

 and Arkansas, P. graciie on leaves of Pinns filifolla from 

 Mexico, P. stalacfiforme on branches of Pinns Murrayana and 

 f- J^fff^y^ 'iJ'orn Washington and Nevada; P. fnsi forme on 

 branches of Pinns Taeda, P. palustris and P. sp. from Alabama, 

 Georgia, Florida and Texas, P. mexicanum on branches of 

 Pinus patula and P. oocarpa from Mexico, P. globosuni on branches 

 of Pinns strobns from Wisconsin, P. boreale on Picea Parryana 

 and P. Engelnianni \vom Colorado, South Dakota, Canada, 

 Washington, P coloradense nom. nov. on Picea Engelnianni and 

 P. Mariana in the western mountains, P. consimile ox\ Picea Mariana 

 and P. rubra from NewYork, Vermont, Ontario, and Minne- 

 sota, P. pseudo-balsamenm nom. nov. on Abi es grandis from 

 California, P. conorum Piceae nom. nov. on cones of Picea 

 Mariana, P. rubra, P. canadensis, P. Engelnianni, and P. excelsa 

 from New Hampshire, New York, Maine, Colorado and 

 Massachusetts, and P. Laricis nom. nov. which probably will 

 be found in America. This treatment of the species of Peri- 

 dermium is, of coursc, liable to correction when proper cultural ex- 

 periments have cleared up many points which are at present un- 

 certain. Perley Spaulding. 



DiETEL, P., Beschreibungen e i n i g e r n e u e r ^//•^^f/«^^//. (Annales 

 mycol. IV. 1906. p. 303—308.) 



Die beschriebenen Arten sind folgende: Uredo Valerianae- 

 Wallicliii Diet. aus dem Himalaya, Uredo Rliei-undulati Diet. 



