the coast of Bretagne by M. Bonnemaison; and added to our Flora 
by Mrs. Griffiths in 1827, who gathered it freely floating in the sea 
opposite Sidmouth. In that locality and in Torbay it has, since 
that period, occasionally been picked up, but the supply is neither 
regular every year, nor at any time has it been abundant. 
Whilst this sheet was preparing for the press Mr. M’Calla dis- 
covered a new station at Carrickfergus, in the north-east of Ireland, 
where he obtained three specimens, one of which is of the average 
size of English specimens, and fully developed, the other two m 
a young state. ‘These were washed on shore in October 1845, 
in company with a considerable quantity of the rare Pol. subuli- 
fera and of Chordaria divaricata, Ag., a species new to the 
British Flora, which we shall have the pleasure of figurmg in our 
next number. 
There is no British species so nearly allied to P. furcellata as 
to be confounded with it, although when examined microscopi- 
cally we perceive a considerable affinity on the one hand to P. 
nigrescens, and on the other to P. fastigiata. Between these two 
species indeed, P. furcellata appears to me to be almost iter- 
mediate. The relative length and the structure of the jomts are 
very much those of P. nigrescens, from which the dichotomous, 
not pinnate, ramification, the want of leading stem, bright colour, 
&c., abundantly distmguish it; while, on the other hand, the 
ramification nearly approaches that of P. fastigiata; but then, 
the nature of the joints, the colour, and the flaccid substance are 
very different. 
There is another species which ought to be here noticed as 
being closely related to P. furcellata, namely, P. corymbifera, a 
native of the Cape of Good Hope. This, if my specimens are 
correctly named, is a more robust plant, with more distant dicho- 
tomies, more acute axils, and remarkable for its densely corym- 
bose fastigiate multifid lateral branchlets, and the number of 
tubes contained in the stem is twelve or thirteen. It has, how- 
ever, very much the habit of a luxuriant specimen of P. furcellata, 
and though truly distinct, by the above mentioned and some other 
minor characters, might easily, on a hasty inspection, be mistaken 
for that species. 
Fig. 1. PonystPHONIA FURCELLATA :—natural size. 2. Branchlet. 3. Section 
to show the different lengths of the joints. 4. Ramulus bearing tetraspores. 
5. A tetraspore (undivided ?) removed. 6. Fibrilliferous apex. 7. One 
of the fibrille. $8. Transverse section of the stem :—all magnified. 
