26 ARKIV FÖR BOTANIK. BAND 12. N:0 9. 



really found in Spongospora, we should rather conclude, 

 that this organism is not a Plasmodiophoracea. 



Tetramyxa parasitic«^ Goebel.^^ 



About this fungus we shall only state that we have 

 studied tlie cytology of it and that we have seen the most 

 part of the figures characteristic for the other Plasmodio- 

 phoraceae (fig. 71 — 78). In 1910 Maire and Tison^^ have 

 shown, that Teiramyxa parasitica was really a Plasmodio- 

 phoracea. 



An other species of Tetramyxa, T. Triglochinis Moll.^^ 

 is according to Maire and Tison^*^ devoid of spores, and for 

 this reason they have classed it as a new genus: Molliardia. 

 It must be left to the future to decide, whether T. Triglo- 

 chinis is really devoid of spores. 



The relationship of the Plasmodiophoraceae with the 

 holocarpic Chytridiaceae is beyond doubt. Several species 

 have by degrees been pointed out which occupy an inter- 

 mediary position — even though most of them are still in- 

 sufficiently examined — especially from a cytological point 

 of view. 



Such are evidently: 



Chrysophiyctls endobiotica Schilberszky, de- 

 scribed in 1896 from Hungary ^^ as found on potatoes. In 

 1909 Jacob Eriksson^^ mentioned this fungus. It has been 

 found in several countries, Hungary, England (many 

 places), Scotland, Rhenish Prussia, near Arnsberg in 

 Westphalia and in Ireland. Eriksson states that the 

 fungus is devoid of mycelium, but that it propagates by 

 large, tawny zoosporangia (1 — 3 in each cell) in which are 

 found a very great number of zoospores. Moreover the 

 fungus has polygonal resting-spores, one in each cell. Cysts 

 are unknown. — It thus seems to be more closely-related to 

 Chytridiaceae. 



Asterocystis radicis de Wildeman^' resembles the 

 last species in that it has large zoosporangia and resting- 

 spores, but no cysts. 



