CONCENTRATION OF TISSUE FLUIDS OF EPIPHYTES 
Average Con- 
Habitat centration, P 
Rocky slopes 15-94 
Canyons 13.33 
Arroyos 12.99 
Bajada slopes 20.53 
Salt spots 23.57 
All habitats 15.15 
These values are (roughly speaking) from 4 to 7 times as large as 
those for the epiphytic families. 
For the Jamaican series, and unfortunately only for the Jamaican 
series, it is possible at this time to compare the averages for epiphytic 
and terrestrial forms from the same habitat. 
Table 4 gives the averages of the species means for each habitat 
for the Orchidaceae and Bromeliaceae and for the genus Peperomia of 
Table 4 
Comparison of Osmotic Concentration of Epiphytic Plants with that of Terrestrial 
Herbaceous Plants in the Montane Rain Forest 
Average 
Orchidaceae 
Bromeliaceae 
Piperaceae 
Habitats 
for 
Average 
Difference 
Average 
Difference 
Average 
Difference 
Terrestrial 
for 
and 
for Epiphy- 
* and 
for 
and 
Herbs 
Epiphytic 
Relative 
tic Brome- 
Relative 
Epiphytic 
Relative 
Orchidaceae 
Value 
liaceae 
Value 
Piperaceae 
Value 
Ruinate of the 
leeward slopes 
A=0.8l2 
A =0.385 
-0.427 
P=9'77 
P=4.6o 
-5-17 
{n = i7) 
in=2) 
47.1% 
Leeward ravines 
A -0.628 
A =0.280 
-0.348 
A =0.357 
— 0.271 
-P = 7.59 
P = 340 
-4.19 
P = 4.23 
-3-36 
(w = i3) 
(n=2) 
44-8% 
(w=3) 
55.7% 
Ridges and 
A = o.7i8 
A =0.267 
-0.451 
A =0.305 
-0.413 
A =0.431 
— 0.287 
P = 8.63 
P=3.22 
-541 
i'=3-65 
-4.98 
-P-5.19 
-344 
{n = 8) 
(w=4) 
37.3% 
(w=2) 
42.3% 
(w = i) 
60.1% 
Windward 
slopes and 
ravines 
A =0.627 
A =0.292 
-0.335 
A =0.310 
-0.317 
A =0.330 
-0.297 
P = 7.52 
—4.02 
^=3.73 
-3-79 
P = 3.98 
-3.54 
(w = i5) 
(w=4) 
46.5% 
(w=3) 
49.6% 
(w=4) 
52.9% 
All habitats 
A =0.700 
A =0.280 
—0.420 
A =0.330 
-0.370 
A =0.353 
-0.347 
^"=3-37 
-5.06 
^^=3.96 
-447 
P=4.23 
—4.20 
in= 53) 
(w = io) 
40.0% 
in = 7) 
47.0% 
in = 8) 
50.2% 
