discovered magnificent specimens growing along the mud-covered 
base of the harbour pier at Torquay, in which locality it may be 
found in more or less plenty every summer. More recently it 
has been found in Wales and Cornwall. From Mrs. Griffiths it 
received the very appropriate name of ‘“‘ Fern-leaf,” aptly express- 
ing the finely pmmated character of the branches, which do indeed 
closely resemble fairy ferns, so delicate that it is altogether impos- 
sible in a figure to do justice to their beauty. Our representation 
of the natural size must therefore be regarded as merely giving the 
general effect of a specimen held at arms length from the eye. 
As a species, it is very closely related to Cal. thuyoideum, with 
which it agrees in many characters, but from which it may be 
known by the greater proportionate length and breadth of the 
plumules, their more distichous arrangement and closer position; 
the shorter and more cylindrical jomts of the main branches, 
and larger size of the frond. Both species agree m producing 
their ¢e¢raspores on the tips of the ultimate ramuli, a character 
by which they differ from all other British species with decom- 
pound-pinnate fronds. 
Fig. 1. CALLITHAMNION GRACILLIMUM :—unatural size. 2. A plumule: mag- 
nified. 3. Ramulus with tetraspores. 4. Ramulus with a favella. 5. Portion 
of a favella ruptured, and discharging seeds 6. Tetraspores removed and 
dissected :—all more or less magnified. 
