with connecting fibers in which a cell plate is forming ; cytopl 
1900 | DIVISION OF CELL AND NUCLEUS IN LIVERWORTS 399 
FARMER, J. B.: is in Hepaticae: On Padlavicinia decipiens Mitten, 
Ann, Bot. 8:35. 
: Spore Se and karyokinesis in sa coups Ann. Bot. 9: 363. 
1895 
: On spore formation and nuclear division in Hepaticae. Ann. Bot. 
is 1895. 
MortigR, D. M.: Beitrige zur Kenntniss der Kerntheilung in den Pollen- 
mutterzellen einiger Dikotylen und Monokotylen. Jahrb. f. wiss. Bot. 
30:169. 1897. 
—: Proc. Ind. Acad. Sci. 1898:166. 1899. 
EXPLANATION OF PLATE XXIII. 
The figures were sketched with the aid of an Abbé camera lucida; figs. 
I, 2,9, 10, 17,12, 17, 74, witha Bausch and Lomb 4 oil immersion objective ; 
the others with a Zeiss 2™™ oil immersion and compensating ocular 12. 
All preparations were fixed in the Flemming solution used by Mottier 
(97), and figs. rz, 7 3, rg were from sections 2 thick ; the others, 54. All 
were stained on the slide with Flemming’s triple stain of safranin, gentian- 
violet, and orange G. 
Fics. 1-12, Marchantia; 13-14, Anthoceros. 
Fic. 1. Nuclear figure from archegoniophore of Marchantia ; the centro- 
spheres are visible. 
Fig. 2. The nuclear membrane is drawn out into Srey and chloroplasts, 
with other bodies, are collected about the centrospheres. 
FG. 3. Nucleus previous to formation of the spindle; chromatin masses 
apparent in the linin net. 
Fig. 4. Later stage in which the chromosomes are differentiated. 
F1G. 5. Chromosomes collecting in equatorial region. 
Fic. 6. Spindle stage with chromosomes arranged in equatorial plane; 
each chromosome is seen to be split longitudinally. 
Fic. 7. Same, more highly magnified. 
Fic. 8. A curved spindle. 
FIG. 9, Formation of daughter nuclei. 
FIG. 10. First appearance of nuclear plate. 
Fic. 11. Bulged spindle, plate building toward the cell walls. 
Fic. 12. Nuclear plate complete 
Fig. 13. Spore mother cell of Anthooeiok 
and the nuclear plate in process of formation 
Fig. 14. Spore mother cell of PRRSES. 
showing two of the nuclei only, 
showing two of the nuclei 
asmic strands 
extend also between the chloroplasts and nuclei. 
