Palniellacece 247 



nation of these resting-spores results almost immediately in the 

 formation of an elongated colony. 



Palmodictyon viride Kiitz. is a very rare British Alga which I have only 

 observed from the extreme south-west of England. The cells are globose and 

 5'5 9 p. in diameter ; the cylindrical colonies vary from 28 52 p, in diameter ; 

 fig. 115. 



'- 

 r 

 % 



I 

 - 





, - 

 ^ 



\ 





* 





G 



B 



Fig. 115. Falmodictyun viride Kiitz., from near St Just, Cornwall ( x420). 

 A, part of adult, branched colony; B and C, young colonies. 



Genus Botrydina Breb., 1839. The colonies consist of sub- 

 spherical aggregates of cells of the Gloeocystis-iype, enveloped in 

 a thick gelatinous integument which may reach a diameter of 

 500 p. The genus requires further investigation. 



B. vulgaris Breb. occurs amongst mosses on damp ground, on the trunks 

 of trees, etc. The cells are globose or ellipsoid and 2 7 JJL in diameter. It 

 sometimes occurs in large quantity amongst Leucobryum glaticnm. 



