166 
The development of the karyokinetic spindle as it is now known proves 
conclusively that centrosomes do not exist in the higher plants. 
My own studies, now in progress, confirm my previous statement, and 
so far as they have extended are not at variance with the results of Hof. 
THE CENTROSOME IN Dicryorta. By Davyip M. Morrier. 
{Published in Ber. d. deutsch. Botan. Gesell., Bd. X VI, 1898.| 
Tur CENTROSOME IN CELLS OF THE GAMETOPHYTE OF MARCHANTIA. 
By Davin M. Mortier. 
[Abstract.] 
While making preparations to demonstrate to a class the archegonium 
and its development in Warchantia polymorpha, my attention was attracted 
by conspicuous aggregations on opposite sides of certain nuclei in the stalk 
cells of the receptacle. Closer observation showed that these aggregations 
were due to the presence of ‘centrospheres,” about which and among 
whose radiations were collected chloroplasts and finer cytoplasmic 
granules. 
For our knowledge of centrosomes or ‘“‘centrospheres” in liverworts, 
we are indebted largely to the recent researches of Farmer.’ 
“When nuclear division is about to take place,” says Farmer, in speak- 
ing of the germinating spores in Pellia epiphylla Nees, “two structures of 
a minute size appear on the outside of and in contact with the nuclear 
wall, and from them beautiful radiations extend. These bodies, or cen- 
trospheres, are commonly seen to be diametrically opposite to each other 
in position, for we have not succeeded in demonstrating them in the per- 
fectly resting cells, nor have we been able to ascertain the existence of 
any definite particle within them which would indicate the presence of 
a centrosome. It is true that in some instances such a point could be dis- 
tinguished, but we do not attach much importance to it, siace in the great 
majority of centrospheres it completely eluded recognition.” 
‘Farmer, J. B., and Reeves, Jesse: ‘‘On the Occurrence of Centrospheres in Pellia 
epiphylla Nees.’’ Ann. Bot., VIII, 219-224, 1894. 
Farmer, J.B.: “On Spore-Formation and Nuclear Division in the Hepaticae,’’ Ann. 
Bot., IX, 469-523, 1895. 
