372 



JOTJHNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Canada. — Consignments of potatos affected with potato 

 tumour {Clirysophlyctis evdohioiica), or with any disease 

 '\ affecting the tuber either externally or internally, to be 



destroyed. 



1911. — Issue of instructions for the inspection of imported potatos 

 by the South African Union Department of Agriculture. 



2. Spongospora solani. 



Spongospora solani. J. Brunchorst, in Bergens Museum, 



Aarsheretning, p. 219. (1886.) 

 Spongospora subterranea (Walk.). T. Johnson, in Sci. Proc 



Roy. Duh. Soc. xii. (N.S.), No. 16, p. 165. (1909.) 

 Spongospora scabies (Berk.). G. Massee, in Jo?/r. Bd. Agric 



Eng. XV. No. 8, p. 592. (1908). 

 [Tuburcinia scabies, M. J. Berkeley] in Jour. Roy. Hort. Soc. i 



p. 9, 1846. 



[Sorosporium scabies (Berk.). A. Fischer de Waldheim] i 

 Apergu syst^matique des Ustilaginees, Paris. (1877.) 



[Erysibe subterranea, F. W. Wallroth] in Linncea, xvi. (1842. 



[Protomyces tuberum solani, C. E. P. von Martius] in Dfcj 

 Kartoffel-Epidemie, Miinchen. (1842.) j 



The parasite causing potato canker was first definitely describecj 

 as a Myxomycete by Brunchorst in 1886. Brunchorst disi 

 covered a plasmodium resembling that described by Nawaschin foj 

 Plasmodiophora, which existed within the living potato cells. Thi! 

 Plasmodium became ultimately converted into a spongy mass c| 

 coherent, walled spores — spore-ball. Brunchorst thereupon namej 

 the organism Spongospora solani. In 1906, T. Johnson f pointed oui 

 that the organism responsible for the disease, which he called " corkj 

 scab " in the first instance, was identical with Brunchorst 'i 

 Spongospora solani. 



Massee referred the same organism]: to the Ustilagineae, believiul 

 it to be identical with the fungus Tuburcinia scabies § described t| 

 Berkeley in 1846, and afterwards transferred to the genus Sorosporim 

 by Fischer de Waldheim. 



Johnson 1| stated in his paper, published in the Economic Procee^, 

 ings of the Royal Dublin Society of April 1908, that he had been able j| 

 compare type herbarium material of Sorosporium scabies (BerkJI 



* J. Brunchorst, I.e., p. 219. I 



t T, Johnson, Jahresb. d. Vereinigung d. Vertreter d. angew. Bot., iil 

 (1906). I 



t G. Massee, Jour. Bd. Agr. xv. (Nov. 1908), p. 593; [Anon. ibid. (Ol 

 1908), p. 509]. f 



§ Described as Sorosporium scabies, Fischer de W., by Massee fr<|i 

 Berkeley's specimens in Herb. Kew. Text-book of Plant Diseases, Ed. 1 (IBS', 

 p. 405. ' 



Jl T. Johnson, Econ. Proc. Boy. Dublin Soc, i., part 12 (April 1908), p. 46: 



