water ; but when the plant grows im a sunny situation the whole frond, 
except the tips and the masses of spores, becomes of a greenish yellow. 
Substance gelatinous and tender, closely adhering to paper in drying. 
— 
This plant, in many of its characters, resembles the smaller 
specimens of C. haliformis, of which it was formerly considered 
to be merely a dwarf variety. But it may generally be known 
from all states of that species by its peculiarly bushy, dense 
habit, and the alternate disposition of its branches and ramuli ; 
and when found in fructification the two are clearly distinguished 
by the different form of the capsular fruit. The ceramidia of 
C. kaliformis are hemispherical ; those of C. parvula are of much 
larger size, less abundant, and distinctly conical, with a much 
less evident hyaline border. In the present species also, the 
articulations of the branches are shorter and more equal than in 
C. kaliformis; and those of the main stems never so much dis- 
tended, nor of so great a proportionate length. 
Chylocladia parvula is found on most of our coasts, and 
appears frequent along the Atlantic and Mediterranean shores of 
Europe. Along the eastern shore of North America it would 
seem to be particularly abundant, as it occurs in almost every 
parcel of Algze which I have received from that country. The 
American specimens agree in all essential particulars with the 
European ; but some are much more slender, while others are 
more robust than the generality of British individuals. But 
there is quite as much difference observable among the latter as 
in any of the American forms. 
A species found at New Zealand (C. afinis, Hook. et Harv.) 
seems almost intermediate between C. haliformis and C. parvula, 
having much of the ramification of one, with the fructification of 
the other ; but it is sufficiently distinct from both. 
Fig. 1. CyLocLapia PARVULA :—the natural size. 2. Branchlets with cera- 
midia. 3. Section of a ceramidium. 4. Spores from the same. 5. Branch- 
lets with tetraspores. 6. A tetraspore :—all more or less magnified. 
= pes ™-2 5° ——-—peeie-eee SO eee ares 6 ame” 
