distinguished by the uniform production of short ramuli along 
all its branches, which thus have the appearance, under the 
microscope, of budding rods; the latter known by having a 
few longish ramuli crowded towards the axils of the branches, 
while the rest of the branch is bare. But I am sorry to say 
that in practice I find it by no means easy to distinguish these 
supposed species. It is true that there is no lack of specimens, 
which are thus clearly distinguishable; but then, on the other 
hand, there is no lack of intermediate forms, such as bear the 
names C. secundatum and C. lanuginosum ; C. lucurians, J. Ag. ; 
C. mirabile, Kiitz.; C. minutissimum, Suby.; C. Lenormandi, Suhr.; 
and probably others enumerated by Kiitzing. So that once we 
admit /wo species among these parasites, the door is opened to a 
dozen. It was for this reason that in the last edition of the 
Manual I proposed to reduce the four British forms described 
in ‘ British Flora’ to one, retaining for it the name Daviesii. To 
this decision I have received some earnest protests, particularly 
from Mrs. Griffiths, and in deference to this “ pressure from 
without ’’ I so far deviate from the le I had prescribed to 
myself, as to figure the typical C. virgatulum ; at the same time 
that I retain my opinion respecting its close affinity—af no 
more—to C. Daviesii. 
Fig. 1. Portion of a frond of Ceramium rubrum infested with CALLITHAMNION 
VIRGATULUM :—the natural size. 2. Fronds of Cal. virgatulum :-—magnified. 
3. Part of a fertile branch. 4. Apex of the same, with tetraspores :—more 
or less highly magnified. 
