CONTRIBUTIONS FROM THE CRYPTOGAMIC LABO- 
RATORY OF HARVARD UNIVERSITY. XLIV. 
NEW OR LITTLE KNOWN UNICELLULAR ALGZ&. 
I. CHLOROCYSTIS COHNII. 
GEORGE THOMAS Moore. 
(WITH PLATE x) 
EVER since the discovery by Cohn, in 1872, of the chlomw 
phyllous endophyte, Chlorochytrium Lemne, there has been consié: 
erable interest in algae having such a habit, and much speculatiot 
has been indulged in, both as to their affinities and the methol 
of Petrocelis cruenta J. Ag. He at first regarded these 
100 [4 
