excellent work containing dried specimens of Irish Algæ, one
volume of which has already appeared*
Professor Kützing, 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. ahjssoidea, 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 ramification
he 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 in the same dredge. It
possesses the same rigid suhstance 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. Kützing remarks, not only change its colour, hut prevent its
adhering to paper.
* “ Algaj Hibernicffi,” by WiUiam Mc’Calla, Associate of tbe Edinburgh Botanical
Society. S. B, Oldham, Dublin. 1845. Imp. 4to.
.— o f tie naturalize. 2. Paid of a fflament :
Fig. 1. Cladophoka Maoallana ; _
■ ■ ■ 3. Ramulus :— more Uglily magnified,.
T 2