wide pericarps, containing numerous large grannies ; the cluster surrounded
by several, longish, patent, spindle-form, involucral ramuli. Cohur a dull
red. Substance somewhat cartilaginous, not closely adhering to paper.
The external habit of this species is so different from that of
the other ciliated Ceramia that it can scarcely be confounded
with any of them. It bears a much closer resemblance to a
small specimen of C. ruhnm, to which species there is much
similarity both in the branching and in the length and structure
of the joints; but from which it may be at once distinguished
under the microscope by the minute prickle with which each of
the joints is armed at its outer edge. I believe that it was first
discriminated by Mrs. Griffiths, who communicated specimens to
Professor J. Agardh, from whom it received the name here
adopted. It is by no means common, nor have I seen any
British specimens except those collected by Mrs. Griffiths, and
some for which I am indebted to Miss White, who gathered
them in Jersey. Professor Agardh has obligingly sent me a
specimen from the coast of Spain, which has all the essential
characters of the British plant. Perhaps the most nearly allied
species to C. Jlabelligenm is C. monile, a native of Tasmania,
whose joints are armed with similar prickles,-but the general
branching of the frond and its size are very different.
Fig. 1. Ceeamium elab elligerum :— the natural size. 2. Part of tlie filament.
3. Apex of a filament, bearing tetraspores. 4. Portion of a filament, with
" ; and involucral ramuli. 5. A prickle.
1 î:i
ft