fortunate collector would find it again, and thus establish a 
species which at present rests upon a single specimen preserved 
in the herbarium of Sir W. J. Hooker, and collected early in the 
present century. The figure now given exhibits all the cha- 
racters of the species, faithfully copied from a small fragment 
of the Hookerian specimen. It will be seen that the habit, to 
the naked eye, is that of C. corymbosum, while the micros- 
copic characters are nearer those of C. Borrerz, than those of 
any other species. On comparing our present figure with our 
Tas. CLIX. differences so important will be seen between the two 
plants as to forbid their bemg confounded together, and thus we 
are compelled to retain C. fasciculatum, although it rests on such 
unsatisfactory evidence as a solitary specimen. ‘The diameter of 
the filament is greater than that of the usual state of C. Borreri, 
and much greater than that of C. rosewm, and the constricted 
dissepiments of the ramuli are very characteristic. It will be 
seen by Fig. 6, that the stems are those of a “ Phlebothamnion,” 
Kiitzing. 
Fig. 1. CALLITHAMNION FASCICULATUM :—the natural size. 2. A plumule or 
pinnated branchlet from the same. 3. One of the lowermost pinne. 4. 
One of the upper pinne. 5. Pinne with a tetraspore. 6. Small portion of 
one of the main branches :—all more or less magnified. 
