RHODOSPERME“:. pide’ 
to me, new species of Callithamnion has been sent to me from Plymouth, 
being found pretty abundantly, growing on the Fuci, at low-water mark in 
some part of Plymouth harbour. It was discovered there by Mr. E. M. 
- Holmes, and published by him in the September number of Grevillea, 
accompanied by some beautiful figures, showing its growth, structure, and 
peculiar system of fructification. Whether it be really a new species or 
not, I donot pretend to decide, though I believe it tobe so. However, as it 
seems to me to possess some characters which bring it pretty nearly to 
the corymbose section, I mention it here in order to inform students and 
collectors what a beautiful plant awaits them on the muddy bank at 
Torpoint, Plymouth ; and doubtless ere long it will be found in others 
situations in that locality. This interesting plant is somewhat similar to 
the beautiful Seirospora Griffithsiana (Fig. 193); but the fructification is 
very differently situated, being produced in branched necklace-like cells, 
which arise in tufts from the rachis of the plumules and pinne, just at the 
junction of two opposite branchlets, some little distance below the tip ; but 
these sporiferous filaments are never produced in the terminal branchlets, 
Fig. 204. (a) Callithamnion corymbosum, with tetraspores; (b) the same, 
with favelle, magnified. 
as is the case in Seirospora. There are other remarkable characters 
observable in this plant, but the brief description given above is sufficient 
for my present purpose; and ere long I trust the discoverer may be 
able to publish this plant with a recognised name, and also be in a position 
to state whether it be really a new species, or merely a variety of some 
exotic which has found its way to these shores, and so become associated 
with our marine flora. 
‘Section 5, Pulvinata, contains three small species, which consist of 
densely branched cushion-like tufts, or sometimes like patches of velvet pile, 
usually found growing on rocks near low-water mark. C. Rothii (Fig. 205), 
dedicated to Herr Roth, is said to be a perennial species, fruiting in 
winter. About seven years ago I found this tiny Callithamnion in very 
great abundance, growing on the rocky sides of a cave on the coast of 
Durham, a little below Tynemouth. This cave could only be entered, 
even at low water, in a boat, and, although (as the boatman informed me) 
many a smuggled keg of spirits had been concealed there, I doubt if 
any algologist had ever been there before me. The filaments of this little 
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