ation and comparison show a greater affinity with C. a/bida or 
C. refracta, from either of which, however, it is readily known 
by a difference in ramification. Its peculiarly glaucous colour 
when fresh, jomed to the slenderness of the filaments, and the 
uniform length of the articulations in all parts of the stem, are 
characters by which it may most easily be known. ‘To avoid 
mistakes, I have drawn the magnified portions (fig. 2 and 3) 
from part of one of the original specimens published im the Algze 
Danmonienses. It sometimes grows to a much larger size than 
is represented at fig. 1. 
I am not aware that this species has yet been noticed beyond 
the range of Britain; but the various forms of this puzzling 
genus are so imperfectly deciphered, that it is quite possible 
that it may be found under some other name, among the long 
lists of species published by various Continental authors. But 
this is a pot which can scarcely be settled without a careful 
comparison of authentic specimens in various states. Meanwhile, 
I trust the figure and description now given will serve to make 
the characters of our C. glaucescens more generally known to 
botanists out of England. 
Fig. 1. CLADOPHORA GLAUCESCENS :—of the natural size. 2. Part of a branch. 
3. Ramuli:—wmore or less highly magnified. 
