102 BOTANICAL GAZETTE [ AUGUST 
It seemed necessary, therefore, to study the structure and devel: 
opment of the plant more carefully before it could be decided 
whether or not it really was a new genus. 
Since the plant was discovered by Wright, there have beet 
but three published accounts of this form, for, although tt 
occurs in widely separated regions and upon a number of dif 
ferent hosts, it is but rarely collected. Lagerheim (12) in 1884 
found it off the coast of Sweden, and the next year Reinhardt (14) 
came upon it near Sebastopol, while investigating the flora of the 
Black Sea. The latter observer considered that the variations 
of the host plant seemed to bea more favorable resting pl” 
for the unicellular alga, and it was only occasionally th : : 
individual was found upon the larger more exposed see 
The only reason discernible for this was the fact that the Bp - 
omorpha was exposed to the air except at high tide, ant 
smaller fronds, growing in tufts and more closely adhering 
the piles, retained the moisture longer and were consequel 
more favorable for growth. ‘ 
When viewed with the ordinary low powers of a ™ 
scope, Chlorocystis appears a bright green color, usually 
exactly the same shade as the Enteromorpha cells, but ® 
easily mistaken for them. If the cells of the host pit 
dividing to form branch-like outgrowths and project above 
surrounding tissue, there is a slight resemblance to they" 
