104 BOTANICAL GAZETTE [ AUGUST 
and the impossibility of such an occurrence is easily understool 
when we remember that the single layer of Enteromorpha cell 
is frequently less than half the size of the Chlorocystis, and that 
they could never any more than surround the alga im a vely 
superficial way. When the host is a plant made up of a massol 
tissue, it may be that Chlorocystis assumes a true endophyti 
habit, but in Enteromorpha it certainly does not seem possible. 
Occasionally zoospores get between the tubular frond of the hos 
loosening of the tissue, and finally complete disintegration of 
wise be due to this alga, ce 
Chlorocy stis contains a single large chromatophore, whi 
according to Reinhardt (14), and Wille in Engler and Prantl 
