F. Børgesen: Rhodophyceæ of the Danish W. Indies. 411 



adjacent cells. These small cells are mostly rather flat and from 

 their upper (outer) side a small oblong cell merges vertically into 

 the thick peripheral wall (Fig. 394 F). These cells are formed 

 very early together with the other large cells and are already 

 observable in the quite young parts of the thallus, and they are 

 easily recognizable by means of their homogenous and more 

 refractive contents. When treated with Chlor-Zinc- Iodine they 

 are coloured yellow like the large wall cells and treated with 

 Hæmatoxylin they assume also nearly the same tinge of colour 

 as these. Most probably, as I have already pointed out in my 

 above quoted paper, we have to do with a kind of gland-cells 

 from which is secreted the mucilage in which the living plant, 

 as far as I remember, is mostly imbedded. 



The apical growth of the plant seems to agree fairly well 

 with that of Champia parviila as described by Bigelow. 



As I have pointed out already in my paper mentioned above 

 I cannot agree with Bigelow when he says that "the branches 

 in Champia salicornoides do not come off at the nodes, but may 

 spring from any part of the internodes"; in my specimens the 

 branches always issue at the diaphragms. 



The tetrasporangia are formed in the wall in the following 

 manner. A small cell is cut off now and then from one of the larger 

 cells. This becomes to a great extent filled with contents and gra- 

 dually increasing in size becomes the mother cell of the tetra- 

 sporangium. The tetrasporangia occur scattered over the whole 

 surface of the branches; a transverse section shows that more 

 than half their length emerges into the cavity of the joints. 



The cystocarps are rather prominent, urn-shaped and occur 

 scattered over the surface of the thallus. 



Among the dried specimens a single male plant was found. 

 The antheridial stands are very like those in Champia parvula and 

 occur over the whole surface of the plant. 



Farlow and later on De-Toni in his paper: "II genere Cham- 

 pia Desv." have considered this species only as a variety of Cham- 

 pia parvula. As mentioned above Champia salicornoides certainly 

 is closely related to Champia parvula. But Champia salicornoides 

 is a much larger plant, and the arrangement of the tetrasporangia 

 is not the same and some anatomical differences are also pre- 

 sent, for instance there are several more vertical filaments in this 



