— 101 — 



chromatophores and starch as in some cases intermediate stages 

 are found. Often is a resemblance with Ghytridinean parasites 

 obvious but no zoospores or other traces of such are found. The 

 contents give reaction for proteid-matter with the reagent of 

 Millon and with nitric acid (with following treatment with ammo- 

 nium hydrate). They do not contain fatty substance. By Jodine 

 it is yellowish and by Fuchsine reddish 

 coloured; these cells are further stained 

 with Hansen's trioxyhæmateine of iron. 

 They seem in some cases to disappear 

 and lose the réfringence in the older parts 

 of the plants together with a destruction 

 of the whole cell; most commonly there 

 are no alterations of these cells here. I 

 do not believe that these cells have to 

 do with the formation of the hairs, as 

 these organs are most often connected to 

 ordinary chromatophore-containing cells, 

 neither is it probable that they might 

 be of consequence for the formation of 

 antheridia. 



The advantage of these cells for the 

 plant is totally obscure. Among the many 

 ideas which one can form of this subject 

 I shall here draw the attention to a pos- 

 sible connection between these cells and 

 the nitrifying bacteria which according 

 to Keutner (1904) are common in Sea- 

 water and in the mucilage of the marine 

 Algæ l ). 



I found this form as well in shallow 

 water as in greater depths (10 — 12 met.). 



Ceram. fruticulosum Kütz. ; Fig. Ill; 



Consequent to the remarks of Mr. H. Kylin (1910) concerning 

 the use of the name C. fruticulosum Kütz. it was necessary for 

 me to examine the original specimens of this species. Through 

 the kindness of Mrs. Weber- van Bosse such an examination 

 was realized. The received material consisted of 3 specimens, of 



x ) The bacteria in the mucilage of the species in question are not placed 

 especially in front of these cells; neither I have found bacteria in them. 



Fig. II. 



C. Areschongii: parts of the bark with 

 the réfringent proteid-containing cells ; 

 in 2 a reniform and a lenghtened cell 

 are shown x c. 400. 



plate I, figs. 1, 4 and 5. 



