90 BOTANICAL GAZETTE [august 



a later paper (18) he states that in Polytoma the cilia are inserted on 

 a similar granule which is believed to be a swelling of the ectoplasm. 

 In some cases he saw a delicate filament connecting this with another 

 minute body at the surface of the nucleus. 



In Hydrodictyon (Timberlake 85) the cilia are inserted on a 

 small body lying in contact with the plasma membrane, but inde- 

 pendent of the latter. Protoplasmic strands join this structure 

 with the nucleus. At the poles of the spindle during the differentia- 

 tion of the spore Anlage, and later near the nucleus, two heavily 

 staining granules were seen, but their origin and further history 

 were not worked out. 



In the zoospore origin of Derbesia, according to Davis (21), the 

 nucleus migrates toward the cell membrane and from it many 

 granules, which are not centrosomes, move out along radiating 

 strands of cytoplasm to the surface of the cell, where by fusion they 

 form a ring-shaped structure from which the cilia develop. 



The development of the spermatozoid in Chara has been 



described by Belajeff (2) and by Mottier (71). Here the 



blepharoplast arises as a differentiation of the plasma membrane 

 and bears two cilia. No centrosomes or Plasmahbcker were 

 observed at the base of the cilia, although Schottlander (75) had 

 previously reported centrosomes in the cells of the spermatogenous 



» 



filament. 



Griggs (34) describes in a recent paper a deeply staining body 

 at the insertion point of the cilia in the zoospore of the fungus 

 Rhodochytrium. This is connected by fine cytoplasmic fibers 

 with the nucleus. The author states that no centrosomes were 

 observed. 



In the myxomycete Stemonitis Jahn (56) has made a highly 

 suggestive observation. During the last mitosis in the formation 

 of the swarmers the spindle poles are occupied by centrosomes. 

 During the anaphases the flagella of the two resulting swarmers are 

 seen growing out directly from these centrosomes. 



Among the bryophytes the blepharoplasts in Marchantia and 

 Fegatella have received the most attention. According to Ikeno 

 (53) a centrosome comes out of the nucleus at each spermatogenous 

 division in Marchantia and divides to two, which diverge to opposite 



