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 fi in diameter ; the cylindrical colonies vary from 28 52 p. in diameter ; 

 fig. 115. 





CL, 



A 



Fig. 115. Palmodictyon viride Kiitz., from near St Just, Cornwall ( x 420). 

 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-type, enveloped in 

 a thick gelatinous integument which may reach a diameter of 

 500ft. 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 p in diameter. It 

 sometimes occurs in large quantity amongst Leucobryum glaacum. 



