excellent work contaming dried specimens of Irish Algz, one 
volume of which has already appeared.* 
Professor Kiitzing, who has studied this puzzling genus with 
much care, and to whom I sent a specimen, writes me that it is 
quite new to him, and that he considers it to be a good species, 
allied indeed to C. alyssoidea, Menegh., “but more rigid, less 
thick, with longer joints, and a different ramification.” Mrs. 
Griffiths has also expressed a similar opinion. 
When growing, it has very much the appearance, at first sight, 
of C. rectangularis, so much so, indeed, that until the ramifica- 
tion be closely looked to, and the alternate or secund ramuli be 
observed, it might be mistaken for that species. It grows in the 
same locality, and occurs in similar loosely-bundled masses, and 
often accompanies C. rectangularis im the same dredge. It 
possesses the same rigid substance as that species, and the same 
glossy, bright green colour, except when it is, as most of my 
specimens are, infected with Cocconeis aggregata, which as 
Dr. Kiitzing remarks, not only change its colour, but prevent its 
adherimg to paper. 
* « Algo Hibernice,” by William Mc’Calla, Associate of the Edinburgh Bo- 
tanical Society. 8. B, Oldham, Dublin. 1845. Imp. 4to. 
Fig. 1. CLapopHora MacaLLana :—of the natural size. 2. Part of a filament : 
—magnified. 3. Ramulus :—more highly magnified. 
