useless as a representation of its natural habit ; secondly, because 
Mr. Hassall, in his recent work, considers C. Browns to be merely 
a “condition of C. glomerata,” arising “from the subimmersed 
habitat in which it grows.” This opinion I cannot but regard 
as being too hasty, especially in an author who had never seen 
this remarkable plant growing. It is a mere assumption, for 
there is no evidence to show any passage from the one form 
into the other ; and the forms themselves are so broadly distin- 
guished that the most casual observer could not confound them. 
The habit of Cladophora Brownii is, as I have long since said, 
completely that of Vaucheria terrestris; a habit admirably ex- 
pressed in Mr. Brown’s MS. name “pulvinata’”. Such is very 
different from the sprayey branching of C. glomerata; and if 
this character be regarded as valueless, we must be prepared to 
unite a host of other species with C. glomerata. But, setting 
aside habit, the ngid and tough substance of C. Brownii distin- 
guishes it, even in fragments, from every form of C. glomerata 
that I have seen. The “ Prince of Botanists”, who first detected 
and described it, and whose name it bears, may be allowed to be 
good authority in this matter. He examined the plant in a 
recent state; so have I done ; and so, more lately, has Mr. Ralfs ; 
and we are agreed in pronouncing it a perfectly distinct species, 
at least as well characterized as any other specific form in the 
genus Cladophora, and better characterized than several reputed 
species. I hope the figure now given, and which is a faithful 
representation of the growing plant, will show that we have some 
grounds for our opinion. 
Cladophora Brownii appears to be peculiar to the British 
Islands, and, so far as I know, has only been found im the 
stations above given. At Wicklow, I observed it first nm 1833 ; 
and in 1842, when I next visited the station, the plant was still 
to be found, though not in so luxuriant a state, probably from 
some failure in the supply of moisture. 
Fig. 1. ChapopHora Brown :—xatural size. 2. 3. Filaments removed. 4. Por- 
tion of a filament :—all more or less magnified. 
