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one is working from a boat, is the luxuriant growth of one of the 
calcareous green algae, Halimeda Opuntia, which forms immense 
beds in the floor of the ocean, mostly in water that is from three 
to ten feet deep at low tide. It is no exaggeration to say that 
there are hundreds of tons of this lime-coated seaweed near the 
shores of Key West. The roots and pneumatophores of the man- 
groves serve as places of attachment for a certain group of species 
of algae and this group was found to be well represented among 
Fic, 5. Spanish Moss ( Zid/andsia usneoides) on Trees, Tampa Bay, Florida. 
the two or more species of mangroves which occur on the northern 
and eastern borders of the island. Curiously enough, however, 
the roots of the abundant mangroves about Jupiter appeared at 
the time of my visit to be entirely free from algal epiphytes. 
Four weeks from October 23 to November 20, were spent in 
making collections at Key West. This island has been visited 
by several collectors of algae and enjoys the reputation of being 
