4 ARKIV FÖR BOTANIK. BAND 12. N:0 9. 



Plasmodiophora Brassicae. They are in full accordance with 

 the view of Nawaschin except that, in agreement with Pro- 

 wazek, they observ^ed two raitotical divisions at the sporo- 

 gonical stage instead of one. 



Up till now Plasynodiophora Brassicae has been found on 

 several genera of the Crucif era-family, namely Alyssiün,^^ 

 Ardbis,^'^ Brassica,^ Camelinap Capsella,^'' CheiranthusJ Eruca,'' 

 Erysimum,^^''' Hesperis}'- Iberis,^ Lepidiu7n,^'- Matthiola,^ Na- 

 sturtium,^-^ Raphanus,^-''''^'^^ Sinapis'^'-''^^ and Thlaspi}- 



Last year Marchand ^^ reported having found the species 

 also on the following host-plants outside the Crucifera-family : 

 Melon, Celery and Sorrel • — that is on a Cucurhitacea, an Um- 

 hellijera and a Pohjgonacea. This was, as it was to be ex- 

 pected, due to a misunderstanding as later on shown by 

 Griffon and Maublanc.^^ 



Sorosphaera Yeroiiicae Schroet. 



The occurrence and the history of this fungus are shortly 

 treated in the above named paper by Maire and Tison. — 

 We shall here more exactly estimate its attack on different 

 Fero?iica-species, among w^hich some represent hitherto un- 

 known host-plants for the Sorosphaera, and likewise we may 

 add some new localities in order also to determine its geo- 

 graphical distribution. — For that purpose we are going to 

 cite the results of investigations made by Lagerheim up till 

 the year 1901 as they are put down by this mycologist in 

 his manuscript, as mentioned in the introduction. — It will 

 be seen that Lagerheim already in 1901 knew the correct 

 systematical position of Sorosphaera. 



»Es wurde dieser Organismus zuerst von Schröter ^^ in 

 den Stengeln von Veronica hederifolia in Süd-Deutschland 

 entdeckt, für eine Ustilaginee einstweilen gehalten und unter 

 dem Namen Tuhurcinia Veronicce beschrieben. Winter^^ stellt 

 ihn zu Sorosporium und giebt als neue Wirtspflanze Veronica 

 triphyllos an. Schon in seiner ersten Mitteilung hebt Schröter 

 hervor, dass die Stellung des Pilzes sehr unsicher ist, später ^^ 

 ist er aber zu der Überzeugung gekommen, dass er vorläufig 

 zu den Schleimpilzen zu stellen ist, weil er in manchen Punkten 

 mit Plasmodiophora Aehnlichkeit zeigt ; in dem citierten Werke 



