12 BOTANICAL GAZETTE [JANUARY 
except figs. 1, 15, 16, drawn with compensating ocular 12, and jigs. 8, 9, 10, II, 12, 
drawn with compensating ocular 8. The plate is reduced to two-thirds the original 
size. 
Figs. 1-7.—Vegetative mitosis in the young sporogenous tissue 
Fic. 1.—Vacuolate chromosomes in late telophase. 
Fic. 2.—A young daughter nucleus with the manifestation of polarity by the 
location of the chromatin network and a nucleolus. 
Fic. 3.—A portion of the chromatin reticulum in the resting nucleus. 
Fic. 4.—A part of the chromatin threads arising from a ragged chromatin 
reticulum. 
1G. 5.—A nucleus in which homogeneous chromosomes are just organized. 
Fic. 6.—Portions of chromosomes from an equatorial plate; the chromatin 
material in the central region has become less compact. 
Fic. 7.—Portions of chromosomes in a later ae than jig. 6; constriction has 
begun along two lateral lines. 
Figs. 8-16.—Mitosts in the spore mother cell 
Fic. 8.—Portions of double threads from the nucleus a little before the lep- 
tonema stage; chromatin material of different density in different parts of the 
threads. 
Fic. 8a.—A spore ait: cell with a nucleus whose chromatin is shown under 
higher magnification in fig. 
Fic. 9.—Portions of sath threads from the nucleus in a climax condition of 
synapsis (so-called zygonema stage). 
1G. 9a.—A spore mother cell with a nucleus whose chromatin threads are 
shown under higher magnification in fig. 
1G. 10.—Portions of chromatin double threads from the nucleus in pachy- 
nema Stage. 
Fic. roa.—A spore mother cell with a nucleus whose chromatin threads are 
shown under higher magnification in fig. ro. 
Fic. 11.—Portions of double threads in cl agen stage; the independent 
two have on to separate. 
Fic. r1a.—A spore mother cell with a nucleus whose chromatin threads are 
shown under higher magnification in jig. 17 
Fic. 12.—Portions of chromosomes in diakinetic stage. 
Fic. 12a.—A spore mother cell with a nucleus whose chromosomes are shown 
under higher magnification in fig. 12. 
1G. 13.—Portions of chromosomes with spindles in an equatorial plate. 
1G. 16.—Telophase in 5 the second division. 
