ARKIV FÖR BOTANIK. 



BAND 12. N:o 9. 



Cj tologic.al Studies in tlie PLasmodioplior.aceae. 



By LIBRA fr 



MEW Vü 

 BOTANIC 



(With 3 plates.) ÜAKDB 



O. WINGE. 



Coinmnnicated June oth 1912 bv J. Eriksson and G. Lagerheim. 



During a stay in Stockholm in the months of October — 

 November 1910 I had occasion to undertake some cytological 

 investigations into the Plasmodiophoraceae, of which this 

 memoir is the result. 



This paper in the first instance owes its existence to 

 Professor G. Lagerhetm, who kindly supplied me with a welJ- 

 preserved material, collected by himself some years previously 

 in different localities in Norway and Sweden. Besides the 

 material itself some stained sections, cut on the microtome, 

 were likewise placed at my disposal as also the figures of 

 the macroscopical habit of the Plasmodiophoraceae, found in 

 this paper. Disregarding the necessity of producing a few 

 micro-preparations and of staining anew some of the slides 

 already present, all I had to do was »to look». — In the 

 year 1901 Lagerheim had initiated a revision of the material 

 and had put down nearly everything known about this family 

 up till the said year. He had likewise given a thorough 

 description of the occurrence oi Sorosphaera Fe?-omcaß Schroet. 

 and its attacks on the different species of Veronica. — This 

 unfinished manuscript Professor Lagerhetm kindly handed 

 over to me in order that I might employ it at pleasure. I 

 here seize the opportunity of rendering my best thanks to 

 him for this as well as for many other acts of friendliness 



Arhiv för botanik-. Band 12. N:o 0. 1 



