cell, or forming a transverse band, at length in certain joints,
especially towards the apices, becoming transverse, and ultimately
dividing into four distinct subelliptic spores.
Whatever general resemblance this plant and its congeners
may have to Draparnaldia, I do not doubt that Kutzing has
judged very rightly in placing it in a distinct genus and even
iannly. The fruit in Draparnaldia when present is external,
as in Chcetophora. Kutzing, unfortunately, has not figured
his Draparnaldia omata, in which he has found the fruit
abundantly. Mr. Thwaites has shown me the fruit of Stygeo-
clonium exactly as it is figured by Kutzing, and in the plate
from specimens communicated by Mr. Ralfs. Mr. Hassall
indeed informs us that he has seen a quaternary division of
the endochrome in other Draparnaldice, but he does not say
positively that he has seen it in Draparnaldia glomerata and
plumosa, or in any typical species. Should it really occur in
them, it is highly improbable that they should also possess
external fruit, nor indeed is it certain that it has been found
except in D. omata. It is at least clear that D. tenuis and
D. omata are not congeneric. Mr. Ralfs has observed that
the present plant, when left for a time in water, forms a
scum of molecules. Agardh has seen young plants growing
from the scum. The bodies represented in the plate are
germinating spores. In Mr. Ralfs’s plant, which is Agardh’s
var. /3. elongata, all the joints are completely filled with the
endochrome; in those figured by Agardh and Mr. Hassall,
the green matter forms a transverse central band. It should
be observed that Mr. Hassall’s D. elongata is quite different
from Agardh’s variety of D. tenuis. — M. J. B.