CODIUM. il 
only in very old septa that we were unable to demon- 
strate the presence of stainable substance in the channel. 
Finally the lumen becomes completely obliterated. 
B. REPRODUCTIVE ORGANS. 
The reproductive organs of Codium have been the 
subject of investigation by several algologists. 
Thuret (Recherches sur les zoospores des Algues, Ann. | 
Sc. Nat., 3e. Sér., Bot. XIV.) showed that oval sporangia 
were formed from the upper parts of the swollen palisade 
bd 
“cells, each giving rise to biciliate swarmspores which, 
he affirmed, developed directly into new basal filaments. 
Derbes and Solier (Mémoire sur quelques points de la 
physiologie des Algues, Stippl. des Comp. Rend!., 1856) 
describe the formation of the sporangia and state that they | 
become separated from the parent filament by a partition. 
The internal green mass resolves itself into zoospores 
which escape en masse, afterwards separating from each 
other, swiuming actively apart. The authors were unable 
to determine the cilia, nor did they follow out the sub- 
sequent history of the zoospore. Schmutz (loc. cit.) added 
some notes on the nuclei of the zoospores. 
In 1880 Berthold confirmed the occurrence of biciliate 
zoospores, but did not succeed in getting them to germ- 
inate. On the other hand, he affirms the existence of 
minute yellow biciliate swarmspoores formed in quite 
similar sporangia, and he states that he succeeded in 
obtaining young plants only when both kinds of fructifica- 
tion were present. 
Lastly, Went (Les modes de Reproduction du Codiwm 
tomentosum, Vergad. der Ned. Bot. Vereen., 1889) re-in- 
vestigated the question and added new facts. He confirms 
Berthold on the question of the existence of large green 
zoospores and sinall yellow ones, but he states that, con- 
