4 HoweE: MONOSPORANGIAL DISCS IN LIAGORA 
wall is abjointed as a one-celled gemma, but when abjointing 
occurs the subjacent cell commonly goes with it, the two together 
(Fics. 7 and 8) constituting a two-celled gemma. In this case, 
the lower of the two cells seems not to divide but to persist as a 
finally inconspicuous stalk or appendage of the young disc, which 
results from divisions of the upper cell (Fic. 22). Very rarely 
(Fic. 28), one finds an irregular pluricellular gemma formed with- 
out obvious rejuvenescence or with rejuvenescence limited to one 
or two of its cells. Occasionally (Fic. 9) several consecutive 
Fic. 25. Terminal cells of an assimilatory filament of Liagora ceranoides sane 
4778d, from Montego Bay, Jamaica), showing enlargement and rounding or two of 
them preparatory to their division to form multicellular gemmae, which develop 
into monosporangium-bearing discs. > 510 
G. A later stage, showing young disc, still attached, disc a 
together corresponding to a twice forked vegetative branch four cells long deri 
4778d), X 620. 
Fic. 
nd stalk-cell 
IG. 27. Dorsal view of a young disc, slightly smaller than that shown 2 
Fic. 26 (No. 4778d). X 260. < 
Fic. 28. Apex of an assimilarity filament showing irregular division to i 
gemma (No. 3141, L. ceranoides, Gun Cay, Bahama Islands). X 620. ee 
Fic. 29. A gemma in a three-celled stage, the original mother-cell wall ee 
tinizing at apex (No. 3741). X 510. : 
cells of a filament are converted into aplanospores with evident e 
rejuvenescence and with gelatinization of the original walls. ve 
The first divisions of the rejuvenated cell appear to occur a : 
variety of ways. Often (Fics. 8 and 29) they suggest the “crue 
