60 Floristik, Geographie, Systematik etc. 



ved to have been introduced with Egyptian cotton. Amongst Algae, 

 Pithophova oedogonia and Compsopogon sp. have been reeently 

 discovered; both are species from tropical America, but the former 

 occurs in the Reddish Canal in low and high temperatures, while 

 Compsopogon is found only where the water is 73° F. to 75° F., and 

 is a species new to Britain. W. G Smith. 



Wibeek, E„ Hvita bläbär {Myrtülus nigra Gilib. f. leucocarpa 

 Dum.) funna pä Oland [Weisse Beeren von Myrtülus nigra, 

 aufÖlandgefunden]. (Svensk botanisk Tidskrift. IL p. (118— 119). 

 1908.) 



Wittrock, H., Lokal för „hvita bläbär" [Lokalität für 

 weisse Heidelbeeren]. (Ebenda. III. p. (18). 1909.) 



Peters, G., Hvita bläbär i Angermanland. [Weisse Hei- 



o 



delbeeren in Angermanland]. (Ebenda. III. p. (18). 1909.) 

 Krok, Th. O. B. N., Ytterligare fyndorter i Sverige för 

 hvita bläbär [Weitere Fundorte in Schweden für weisse 

 Heidelbeeren]. (Ebenda. III. p. (70—71). 1909. 



Schon in den 1830er Jahren wurden „weisse Heidelbeeren" auf 

 Öland im Kronforst Böda angetroffen. Innerhalb desselben Ge- 

 bietes, auf mehreren Standorten, wurde neulich dieselbe Form — 

 nach mehr als 80 Jahren — wiedergefunden. Infolge dieses Fundes 

 werden nun in den obenzitierten Aufsätzen sonstige schwedische 

 Fundorte angeführt, woraus hervorgeht, dass die fragliche Form 

 gegenwärtig in Schweden an wenigstens 19 verschiedenen Plätzen 

 in 9 Provinzen beobachtet ist (von Smäland im Süden bis nach 



o 



Angermanland im Norden. Rob. E. Fries. 



Wiinstedt, K., Optegnelser fra en Ruderatplads [Notes 

 from a waste place]. (Bot. Tids. Köbenhavn, XXIX. 3. p. 330— 

 333. 1909.) 



The author has investigated the ruderal plants of a waste place 

 at Horsens, a little Danish town, during the years of 1876—1906 

 (mostly 1902—1908) and has noted the variations observed during 

 this period. Most of the species disappear very soon, but some few 

 of the foreign species have been noted every year and may be taken 

 as new inhabitants of the fiora. In a list all the 60 species observed 

 are given together with the data of their occurrence. 



C. H. Ostenfeld. 



Woodruffe-Peaeock, E. A., Followers of Man. (Journ. of Bot. 

 558. p. 223-228. 1909.) 



Observations on habitats and distribution in Lincolnshire of 

 Chelidonium majus, Sonchus asper and 5 oleraceus, indicating that 

 these plants occur over a wide ränge of soils but are always near culti- 

 vation or human habitations. The occurrence of Anagallis arvensis 

 and its Status as a colonist is also discussed. W. G. Smith. 



Yapp. R. H., On Stratification in the Vegetation of a 

 Marsh, and its relations to Evaporation and Tempera- 

 ture. (Ann. Bot. XXIII. 90. p. 275—319. PI. XX. and 8 text-figures. 

 1909.) 



The marsh (Flachmoor) where the observations were made is 



