208 
PACIFIC SCIENCE, VoL VIII, April, 1954 
growth-affecting substances (indole acetic 
acid, colchicine, or benzimidazole) were added 
to the medium. The culture containing ben- 
zimidazole and grown in natural daylight did 
not show a greater accumulation of hema- 
tochrome pigment or an increase in growth 
rate. No attempt is made to explain the bio- 
chemical effect of growth-affecting substances 
upon Phycopeltis. It is shown, however, that 
a greater accumulation of hematochrome pig- 
ment can be brought about by increasing the 
growth rate. In nutrient media, hematochrome 
accumulation in Phycopeltis is correlated with 
growth rate. The algal masses that showed 
the greatest increase in area covered also con- 
tained the greater amount of hematochrome 
pigment. 
Green Phycopeltis filaments incubated for 
24 days upon media containing colchicine 
became orange in color, whereas orange fila- 
ments treated in like manner did not change 
in color. The green controls remained green, 
but the orange controls showed the presence 
of green filaments. It is quite conclusive that 
colchicine increases the accumulation of hema- 
tochrome pigment in Phycopeltis. 
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