4 BOTANICAL GAZETTE [JULY 
Chromatin granules thus formed gradually move away from the 
membrane; the chromatin fibrils lying mixed with the granules form 
globules here and there; and the granules and globules then develop 
so that they become nearly spherical and uniform in size, being 
about 22 in number. They are chromosome primordia. The 
chromatin fibrils are all used up in the formation of chromosomes, - 
and the nucleus contains only the chromosomes, a nucleolus, and 
the nuclear sap. When the chromosomes become arranged at the 
equatorial plate, kinoplasmic accumulations, developed from the 
cytoplasm surrounding the nuclear membrane, appear at the poles. 
A well marked centrosome-like structure in the kinoplasmic masses 
occurs only at metaphase, disappearing in anaphase. The chromo- 
somes split longitudinally and half of each chromosome proceeds to 
each pole. During this process, the spindle is intranuclear. At 
telophase or at late anaphase, the nuclear membrane disappears 
and the two sets of crowded daughter chromosomes are surrounded 
by the cytoplasm, and the formation of the nuclear membranes 
follows. When the daughter nuclei are organized, the central 
spindle disappears completely. The cytoplasm lying between the 
two nuclei assumes a coarse, irregular alveolar structure, and the 
walls of the alveoli, probably after a change in their material, form 
a new cell plate. This process is similar to that in Fucus (20) and 
Cutleria (22). 
Male and female gametangia 
Mature gametangia.—Both 
. . male and femal i 
mixed on certain p € gametangia occur 
the mature plant j 
