ramuli or processes may be observed on the peripheric filaments. Favellidia 
dark red, globose, seated among the beaded apices, composed of innumerable 
angular spores. In var. 8, the frond is either quite simple, or merely forked 
at the base. 
~~ 
This plant, which is found on most of the rocky shores of 
Europe, and probably identical with the Mediterranean species 
which I have ventured to unite with it, was first described by 
Weber and Mohr in their ‘ Travels in Sweden’*, and soon after- 
wards taken up by Roth in his ‘ Catalecta Botanica’. It occurs 
in considerable plenty on our western shores, growing near low 
water mark, either on the bare rocks, or on shells attached to 
them; and generally in situations where it is exposed to the air 
for a few hours, and at the same time subject to be lashed by 
the waves. Mr. Thompson, on the contrary, finds it at New- 
castle, Co. Down, growing in very shallow ¢zde-pools on granite 
rocks, and there only. 
Except in the degree of ramification, it has no varieties: and 
characters, drawn from the more or less frequently forked frond, 
can scarcely, I fear, be depended upon; for in the same locality 
I have found a very considerable difference im this respect. Mr. 
Ralfs observes that at the Land’s End the specimens are either 
quite simple, or merely forked at the base; and these we regard 
as being identical with the Mediterranean JV. dudricum. Again, I 
possess a specimen from the Mediterranean marked JV. ubricum 
by Professor J. Agardh, which is repeatedly dichotomous. I 
confess that I am at a loss to see on what characters authors 
contend for the existence of two species. ‘There is no difference 
of structure that I can perceive, and it would seem that rami- 
fication is equally disregarded as a character by Agardh, as by 
myself. The specimens here figured represent the usual size 
and degree of branching which the plant attaims on the west 
coast of Ireland; Scotch and Baltic specimens are often much 
more divided, more slender, and of smaller stature. 
Fig. 1. NEMALEON MULTIFIDUM, growing on Mytilus rugosus :—natural size. 
2. Filaments of the periphery, with a small portion of the axis. 3, 4. Side 
and front views of the favellidium, surrounded by beaded filaments. 
5. Spores :—all magnified. 
* «Reise durch Schweden’. 
