re a a a ee pe ee a 
1899] SPORE-MOTHER-CELL OF ANTHOCEROS 109 
Fic. 9. Second division of the chloroplasts. 
Fic. 10. Spore-mother-cell at maturity, four chloroplasts. 
Fig. 11. First indication of approaching mitosis, accumulations of filar- 
plasm around the nucleus whose membrane appears less clearly defined. 
Fig. 12. Prophase, filarplasm well differentiated. 
Fig. 13. Prophase, one pole of spindle developed. 
Fic. 14. Late prophase, the two poles of the spindle differentiated, four 
chromosomes assembled in the equatorial region. 
PLATE X. 
Fic. 15. Early metaphase, four chromosomes at nuclear plate. 
FiG. 16. Metaphase, strongly developed mantle fibers. 
Fic. 17. Metaphase, granular cytoplasm around the nuclear figure. 
Fig. 18. Late metaphase, after splitting of the chromosomes, very clearly 
defined spindle. 
Fig. tg. Anaphase, spindle still clearly defined. 
FiG. 20. Telophase, trace of spindle in equatorial region. 
Fig. 21. Spore-mother-cell, daughter nuclei after first mitosis in rest- 
‘ng condition, four chloroplasts. 
FiG. 22. Nuclear plate at first mitosis, side view. 
Shes os Nuclear plate of second mitosis viewed from pole of spindle, 
cating longitudinal splitting of the chromosomes. 
ae spies sections of same spore-mother-cell during second 
the 7: mis on plate of one spindle with four chromosomes viewed from 
: ; Side view of the other spindle. 
ee Center. of spore-mother-cell showing three nuclei, cytoplasm 
th sated around the nuclei and chloroplasts, delicate strands connecting 
€ regions, 
in riick indication of the position of the walls that are to be formed 
‘o form a delic er-cell ; the coalescence of connecting strands of cytoplasm 
ate film. 
1G. 27. Final separati 
mother-cel], paration of the protoplasmic contents of the spore 
