AND SPECIES HYBRIDS WITHIN THE GENUS SACCHARUM 145 
observe this arrangement in anaphase both when viewed from the 
poles and from the side. Unpaired chromosomes never lie in the center 
of the aequatorial plane. During telephase (fig. 45) unpaired chromoso- 
mes are no longer seen on the spindle, all of them having been incorpo- 
rated in the daughter nuclei except in the rare cases in which chromo- 
somes fall to pieces and perhaps finally are resorbed. Dwarfnuclei, for- 
med by unpaired chromosomes, have never been seen by me. In the fi- 
gure one sees some extranuclear nucleoli in the plasma around the 
clumps of chromosomes ; occasionally a much larger number of these is 
found in Saccharum. They have been found in other plants also by se- 
veral investigators and have nothing to do with dwarf-unclei. 
Doutbless more than 40 chromosomes may also reach the nuclear 
ES me 
8 Rat, 
ness « 
PAL Ar 
DN 
6 
Fig.. 47. 

Fig. 46. 
Fig. 46. Homotype division of Green German New Guinea x 2300. 
Fig. 47. Anaphase of the homotype division of G. G. N. G. x 2300. 
plates of the homotype divisions. In fig. 46 one observes in both nu- 
clear plates fully 50 chromosomes. Very exact counts of homotype nu- 
clear plates are impossible; the chromosomes are very small and lie 
close together. Fig. 47 shows an anaphase of a homotype division ; in 
each of the chromosomegroups moving apart, approximately 45 chro- 
mosomes were present. It occurs rarely in this division that chromoso- 
mes lag behind in the aequator. 
Genetica V 10 
