RED SEAWEEDS 
N Rhodophycez, known also as Floridee and Rhodospermez, 
' alge attain their highest development. This is marked by 
the mode of reproduction, which, more nearly than in: the other 
subclasses, resembles that of flowering plants. The fronds, how- 
ever, are not as large and do not as closely resemble stem and leaf 
as do some species of the brown alge. 
The. species of this subclass are very numerous, and the variety 
in their fronds, their delicate texture, and their colors, which vary 
from pink to purple, make them the most attractive of the sea- 
weeds. They grow mostly in deep water, but are often found 
washed ashore, and many grow just below low-water mark and 
on the shady side of tide-pools. 
In the simplest species the frond consists of branched cell-rows. 
In some of these the filaments are so fine that a pocket-lens is re- 
quired to determine the differences in branching and fully to 
appreciate the beauty of the plant (Callithamnion). Some have a 
cell-surface. In Delesseria the membrane assumes the outline of 
a foliage-leaf. Dasya, which is an abundant variety, is especially 
beautiful in its feather-like appearance. The corallines are siu- 
gular in that they are incrusted with lime and resemble corals. 
ORDER NEMALIONACEZ 
SUBORDER HELMINTHOCLADIEE 
Genus Nemalion 
The threadweeds. 
N. multifidum. Frond six to twelve inches long, cylindrical, solid, 
cord-like, elastic, tough, shiny, very gelatinous; branches repeatedly in 
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