100 BOTANICAL MAGAZINE. [Vol. six, 



recognize either the asters or the Centrosomes. The kariokinetic fignres in 

 both aster and disaster stages resemble very much to that of the fluwering 

 plant. 



Just before the last mitosis takes place in the antheridium of Makinoa 

 the cells assumes a more or less spherical form somewhat like the pollen- 

 mother-cells of many flowering plants. At the spindle-pole of the last 

 division I was able to recognize neither centrosome or blepharoplast. I 

 often observed two groups of granules nearly opposite to each other, in 

 some distance from each pole of the spindle. I have not yet succeeded in 

 following the fate of these granular bodies. It is not improbable that these 

 bodies would function as a blepharoplast in the cilia-formation of the sper- 

 matozoid. In the fully developed spermatozoid I often observed a deeply 

 staining spherical body in the cytoplasm which is very probably a blepharo- 

 plast. The identity of these two structures and their relations to cilia- 

 formation would only be revealed by future careful studies which I hope 

 to undertake. 



The occurrence of Centrosome in the Hepaticete has at the first time 

 been reported by Schottatuler in 1892. The first careful study about 

 this subject has been made by Farmar. In 1894 he described together 

 with Reeves asters and centrosome for the early mitosis in the germinat- 

 ing spore of Pellia.^ In the following year he reported the occurrence of 

 centrosome in several other species of Hepaticete. 3) In 1899 Davis 4) studied 

 the division of the spore-mouVr-cells of Anthoceros and failed to recognize 

 any centrosome at the spindle pole. In the following year Van Hook 5) 

 confirmed Davis' results concerning the absence of Centrosome in Antho- 

 ceros and described definite Centrosome in the vegetative cells of the 

 gametophyte of Marchantia. Davis 63 in 1901 and Chamberlain 7 ' in 1903 

 confirmed and extended the studies of Fanner in regards to the presence 

 of centrosome in Pellia. However, Davis failed to observe centrosome in 

 the division of the spore-inother-cell and the seta of the sporophyte in 

 Pellia. Chamberlain has not been able to see centrosome in the antherid- 



1) Cohn's Beitriige zur Biologie der Pflanzen, Bd. VI, p. 267. 



2) Farmer and Reeves, Ann. of Bot., Vol. VIII, p. 219. 



3) Farmer, Ann. of Bot. Vol. IX, p. 469. 



4) Bot. Gaz. Vol. XXVIII, p. 89. 



5) Bot. Gaz. Vol. XXX, p. 394. 



6) Ann. of Bot. Vol. XV, p. 147. 



7) Bot. Gaz. Vol. XXXVI, p. 28. 



