THE SPORE-MOTHER-CELL OF ANTHOCEROS. 
CONTRIBUTIONS FROM THE HULL BOTANICAL 
LABORATORY. XV. 
BRADLEY MooORE DaAvIs. 
(WITH PLATES IX AND X) 
Anyone who has ever examined sections of the sporogonium 
of Anthoceros must have been impressed with the extreme beauty 
of the spore-mother-cells as they are exhibited in all stages of 
development throughout the length of this structure. The excep- 
tional chloroplast and the various conditions illustrating the 
division of the cell-contents to form the spores are perhaps the 
most striking features presented. These led the writer to attempt 
a detailed examination in the hope that light might be thrown 
on certain problems that interest the student of plant cytology 
The work of Farmer (’94 and ’g5) is the only contribution 
of a detailed nature upon the cytology of the Hepatice. He 
did not study Anthoceros but confined himself chiefly to certain 
tSalloid Jungermanniacee and reported some very interesting 
and remarkable conditions. The present investigation does not 
“gree with his accounts of the processes of nuclear division pre- 
Be hy such forms as Pallavacinia, Aneura, Fossombronia, 
- However, at the outset the writer wishes plies hose 
forms aa at important differences between such divergent 
The eke . and members ot the. Junge 
taught us to of the past few oo cytology have ale y 
trated by eigh of generalizing upon the conditions illus- 
°Y particular cases. 
aa oo deals with the single species Anthoceros 
where ice oe being collected at Woods Hole, Mass., 
ments on — xhe preliminary studies and exper 
1899] ods of fixation. The best results were obtained 
89 
