AND SPECIES HYBRIDS WITHIN THE GENUS SACCHARUM 129 
The chromosomes having reached the poles in telephase, form there 
a dense mass, in which they can not be observed separately (see fig. 45 
p. 144, referring to sugarcane). Subsequently the daughternuclei are 
formed, the separating cell wall developed and the daughternuclei en- 
ter into the resting stage. 

Fig. 18. Fig. 19. 
Fig. 18. Formation of the separation-wall in a diad of Saccharum spontaneum 
(Glagah alas Djatiroto) x 1750. 
Fig. 19. Pollen-dyad of Saccharum spontaneum (Glagah alas Djatiroto) x 2300. 
The formation of a cellwall during interkinesis is characteristic for 
monocotyledons ; among dicotyledons cellwalls are laid down during 
the formation of the tetrad. The diadis seen in fig. 19; in the two nuclei 
chromosomes are cleary discernable some of them in the shape of a 
cross, which shape arises after the chromosomes have begun the longi- 
tudinal splitting to be completed during the homotype division. It is 
impossible to count the chromosomes exactly during this stage as too 
many hide others from view. 
In the homotype division the nuclear spindles usually are arranged 
with their longitudinal axes pretty nearly parallel to one another or so 
that they cross another rectangularly, rarely under another angle. In 
Genetica V 9 
