F. Børgesen: List of species. 



481 



scribed by Richards for Choreocolax Polysiphoniæ^) and thereby 

 showing that we have to do with a real parasite. 



From the transverse section is seen that the cells nearest to 

 the host plant generally are the smallest, but they grow gradually 

 larger. The cells in the middle of the tissue are roundish-polygo- 



Fig. 434. Hypneocolax stellaris nov. spec, 

 a, transverse section of parasite and host. b. part of the same more mag- 

 nified, c, longitudinal section of apex, d, laminated membrane. 

 (a, about 40:1; b and d, about 250:1; c, about 100:1). 



nal, rather irregular in shape with rather thick walls forming a 

 parenchymatic tissue. The cells are more or less filled with rather 

 large, roundish to oval grains of starchs. The cells of the paren- 

 chymatic tissue are usually arranged rather distinctly in rows. 

 Towards the periphery the cells gradually become smaller and 

 are distinctly arranged in rows, forming short filaments. The end 



^) Richards, H. M., On the structure and development of Choreocolax 

 Polysiphoniæ, Reinsch. (Proceed. Americ. Acad, of Arts and Sciences, 

 vol. 26, 1891, p. 46). 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1 (1920) 31 



