136 
rom the town Palmer, I rode up to Hacienda Catalina, which 
e 
is situated perhaps at about 1,500 feet altitude on the eastern 
slope 1 Yunque his is in one of P Rico’s rain centers, 
here the annual rainfall exceeds 3,00 alga-vege- 
erably sufficient; this was, however, not always the case in the 
dark primeval forest, where one could find places with so little 
light that not a single liverwort or fern could live there. 
But otherwise there were algae everywhere. On the tree 
the court-yard of the Hacienda, etc., ery rich vegetation of 
Phormidium, Scytonema, and Stigonema, sometimes mixed 
Chi as for instance Zygogonium and Mesotaenium 
When these can live on dirt banks, it is evidently due to the fact 
that it rains so often that the soil never has time to dry, i. e., 
that it contains moisture enough to keep the algae alive until 
the next rain-show 
Ina ae waerall ine by a brook over the cliffs, the latter 
appeared dark red; this was due to a thick covering of a fresh- 
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Europe in similar locations, besides alee in ae and has been 
collected at two localities in the United States, in the Susque- 
hanna River at Harrisburg, Pennsylvania, and at New Braunfels, 
xas, 
The large rocks, which as at Humacao, partly singly, partly 
in larger masses, are scattered over the landscape, were covered 
almost wholly by a brown vegetation of Scytonema, Stigonema, 
Gloeocapsa, and Chroococcus. 
ie) y way down to Palmer, I found, February 1, in the 
neighborhood of the town, on the stones in the ford across a 
brook, a very rich vegetation of a fresh-water species of Florideae, 
Pate ee (Mont.) J. Ag., earlier known from the 
Luquillo Mounta 
