Cladophorese 



261 



These are sometimes intracuticular, arising from segments high up on the 

 axis and passing down between the lamellae of the cell-wall, finally breaking 

 through to the exterior in the lowermost part of the thallus (Brand, '09) 

 This type of rhizoid is more particularly characteristic of Spongomorpha in 

 the Rhizocloniese. In Cladophora glomerata var. callicoma there are often 

 stoloniferous branches from which new erect shoots arise. 



OU 



Fig. 167. A and B, Cladophora incurvata W. & G. S. West, a Cingalese species which shows 

 polytomous branching very well; A, x 2^ ; B, x 54. C E, successive stages in the 

 formation of a transverse wall in Cl. glomerata (L.) Kiitz., x 900 (after Brand). F, older 

 condition of same showing the joint (j), x 675. i, inner layer of cell-wall ; o, outer layer ; 

 ou, outermost layer. 



The segments of the thallus are very variable in length, being usually 

 from 6 to 12 (or even 20) times as long as their diameter. In Cladophora 

 fuliginosa Kiitz. very long segments occur, sometimes (as noticed by both 

 Harvey and Borgesen) a whole branch being without a transverse wall. The 

 cell-wall consists of an inner and an outer layer, both of which are lamellose, 



