RHODOPHYCE®, OR FLORIDEA 219 
the fruit, at the place where the procarp originally 
was, the cells of the wall part asunder, and there 
arises a cylindrical canal through the whole thick- 
ness of the wall. The cells at the sides of this fruit- 
pore develop dense masses of hair-like cells at right 
angles to the pore, and nearly filling the whole of the 
canal. The pore is often formed very early, before 
the formation of the spore-glomerules, and before 
the spore-clusters have developed in size and have 
become fully matured spores. Such cell-clusters 
gradually develop into spores, the single cells become 
larger and more intensely coloured; and when they 
are mature, the connections between the individual 
spores are gradually loosened, the whole glomerule 
becomes disintegrated, and finally, the fully de- 
veloped round spores are entirely free.” Their 
escape through the pore is gradual, and in fact it 
often happens that some do not escape at all, and 
actually begin to germinate in situ. 
In contrast with the well-developed, vigorous 
fronds of such genera as Chondrus, Gigartina, Phyllo- 
phora, Stenogramme, and Gymnogongrus, Callophyllis 
and Callymenia, the genus Actinococcus is of singular 
interest. .A. rosews grows parasitically on Phyllo- 
phora Brodiei forming externally small cushions 
which have been mistaken by some observers for the 
tetraspore fruits of the host plant. Its rhizoid 
tissue penetrates the inter-cellular spaces of the 
host, but its parasitism is obviously not so complete 
as that of Choreocolaw (Harveyella?) albus. The 
antheridia and cystocarps are unknown, and the 
tetraspores only have so far been recorded. A 
