(3 2 r © r . 
26 Nr. 2. L. KOLDERUP ROSENVINGE: 
Postscript. 
The researches of which the present paper gives an 
account were completed in the spring of 1930 and were in- 
tended to be embodied in the fourth part of my publication: 
The Marine Algæ of Denmark, which I hoped to complete 
at the end of 1930. As an illness prevented me from wor- 
king for a long time, I preferred to publish my investigations 
on this subject in a separate paper which I succeeded in 
finishing and sending to the Academy for publication at 
the end of October 1930. It was only in November that 
I became acquainted with the note af B. D. GREGORY: New 
light on the so-called parasitism of Actinococcus aggregatus, 
Kütz. and Sterrolax decipiens, Schmitz (Annals of Botany, 
vol. 44, no. 177, July 1930), which the author has kindly 
sent to me. 
To judge from the short account of this note, the results 
of GREGORY seem in the main to be in accordance with 
mine. The author maintains that Sterrocolax is not of 
parasitical nature but that the development of the cushions 
begins with a localized hypertrophy of the cortical tissue 
of Ahnfeltia. Within such a tissue he found filaments 
“terminated by darkly-staining somewhat pointed apices, 
and it is believed that these filaments give rise to the extra- 
matrical tissue of Sterrocolax”. It seems not improbable 
that these filaments or their darkly-staining apices might be 
identical with the generative cells described above. The 
author observed fusions between the medullary cells in the 
