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what, being a little longer iu tbe Agardhian specimens; but in
this respect, as well as in their relative breadth, the joints do
not agree throughout the same mass. A very singular fact has
been observed by Mr B e r k e l e y , and I believe by him only,
which would lead us to conclude that many phenomena exhibited
by these curious plants remain to be discovered. The filaments
at a certain period seem to lose the squareness of their figure,
to be attenuated at tlieir extremities, and dilated in the centre;
to become cylindrical and opaque, and in short, metamorphosed
into a moniliform filament, with elliptical or oblong purple
joints, and colourless articulations. Mr B e r k e l e y ’s observations
were accompanied with sketches of the different parts, and
from his accuracy, I have no doubt whatever that he has represented
this remarkable appearance correctly. Indeed, his specimens
afforded me ocular demonstration of nearly the same appearance.
The annexed figures are partly derived from liis
drawings, and partly from my own investigations.
Fig. 1. D. tenue, natural size. Fig. 2. Filaments, magnified.