46 



the apex of the cells as is normally the case in Boodlea and 

 Striivea. 



Annular constrictions at the base of the cells do not occur. 

 The parietal, numerous, small chromatophores are plate- 

 formed, roundish or somewhat polygonal (Fig. 32 c) and in the 

 young part of the filaments connected together with very fine 

 prolongations, forming in this way a dense network. In the 

 older cells these prolongations disappear and the 

 chromatophores occur separated or often together 

 in small clumps. Each chromatophore contains 

 generally a pyrenoid. 



The numerous small nuclei are arranged re- 

 gularly in the wall plasma, as already pointed 

 out by ScHMiTZ (Fig. 32 a). 



Finally, I may point out that the cell wall is 

 thin and seems not to be stratified. 



Hitherto we have only considered CI. mem- 

 hranacea. As to the other species referred to Clado- 

 phoropsis we find in the literature for the most part 

 only such short and fragmentary descriptions, re- 

 ferring only to their outer appearance, that they 

 are of little value for the question of the systema- 

 tic position of the genus ^j. 



An exception is Cladophoropsis brachjartra 

 described in detail by Svedelius^). From Clado- 

 phoropsis membranacea it especially differs by its 

 short cells and rigid filaments, by its distinctly 

 stratified walls and by having the nuclei also in 

 the interior of the cells ; but on the other hand 

 it agrees otherwise quite with CI. membranacea 

 with regard to the whole structure of the cell 

 and the way of growing. How the formation of 

 the wall takes place Svedelius does not mention^). 



Fig. 31. 

 Cladophoropsis 



memhrnnacea 



(Ag.) Bergs. 

 Part of a fila- 

 ment growing 

 out to an inde- 

 pendent plant 



with young 

 branches at the 



.summit and 

 rhizoids at the 



ba.se. 

 (About 10:1). 



places, I have a few times found the apex of a fdament first grow- 

 ing narrow like a rhizoid and this ended with a small attachment 

 disc and Svedelit's also mentions that in Cladoph. brachyarira the 

 apex of the filaments sometimes changes its character, behig rhi- 

 zoid-like. 



Most of these species are mentioned in my paper quoted. 

 Svedelius, N., Algen aus den Landern der Magellansstra.sse und West- 

 patagonien. (Svenska Exp. till Magellanslanderna, Bd. Ill, 1900, p. 304). 

 In this connection I also want to point out, that the Siphouodadus 



