127 



ramified filaments running between each other in all directions in 

 the mucilage found here. 



In a longitudinal section it is seen that the medullary cells 

 are very irregularly branched 

 often more or less starlike 

 (Fig. 136); the breadth of 

 the cells is also very vari- 

 able and this is also the 

 case regarding the length 

 of the cells. The develop- 

 ment of these starlike cells 

 is just the same as is de- 

 scribed by BERTHOLD (1. c., 

 p. 2) for Halymenia. The 

 filaments having got some 

 length swell at the end 

 and from this thickened 

 part filaments grow out in all 



Fig. 135. Grateloupia cuneifolia J. Ag. 



Transverse section of the thallus with 



tetrasporangia. (About 550 : 1). 



directions ; the ends of some 



of these filaments meet other 



similar ones and fuse together 



with them or their ends swell and give rise to new star-like cells. 



The cortical layer is 

 composed of short dichoto- 

 mously ramified filaments. 

 The innermost cells in 

 these are the largest and 

 more irregularly shaped, 

 the outermost small oval 

 to subcylindrical 8 9 fj. 

 long and about 3 // broad 

 and rather closely packed 

 together. 



The tetrasporangia (Fig. 

 135) are formed in the 

 cortical layer and occur 

 scattered over the whole 



surface of the thallus. They are cruciately divided about 30 /j. 



long and 19 // broad. 



Among the dried specimens a single cystocarpic one was 



found. While the tetrasporic specimens have quite a smooth sur- 



Fig. 136. Grateloupia cuneifolia J. Ag. 



Star-like cells from the medullary layer. 



(About 250:1). 



