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Callithamnion roseum is one of the longest described of the
genus, and ought therefore, one would think, to be the best
known. But, as with many old species, several plants which are
now distinguished, were formerly confounded under this name,
and thus it becomes a doubtful matter to which of the modern
species the original synonyme roseum attaches. The species was
first defined by Both in his Catalecta. I have seen no specimen
of the plant of this author, and the type which I have adopted, and
here figure, is derived from a specimen received from Mr. Dawson
Turner, and compared many years ago by that gentleman with
Both’s plant, and from another sent by Mr. Borrer, as the plant
of English Botany. These two specimens agree with each other
and also with the specimens published by Mrs. Wyatt, in Algae
Danmonienses. As far, therefore, as the British flora is concerned,
our notions of Cal. roseum are tolerably definite. It would be
very desirable were our plant compared with the herbaria of
continental authors.
Fig. ] . Callithamnion roseum :— o f the natural size. 2. A pair of plumules
and three articulations of a branch. 3. Part of a pinna, with tetraspores.
4. A small branch, bearing a cluster of favellæ. 5. Binate favellæ. 6.
Joints from the lower part of the stem :— all more or less