1 48 BOTANICAL GAZETTE [march 



appeared. However, the problem concerning the nature of the 

 blepharoplast and its relation to the centrosome, not only in pterido- 

 phytes but in various groups of plants, has been discussed by Str.\s- 

 BURGER (87, with a critical re\iew of the works on this subject), 

 Dangeard (21, on algae), Timberlaee fSo. on akae>. Webber 



Ikeno 



some others. 



Davis 



Oogenesis in pteridophytes has not aroused as much interest as 

 spermatogenesis. Oogenesis in Filicales has been obsenxd in vari- 

 ous forms by Janczewski (40), Goebel ('20). Brixton (q). Camp- 



le (15), and many others. 

 Morphological investigations of the 



and 



Strasbu 



> 



on 



Shaw 



m 



concemin 



A few points of cytological interest 



marized as follows : 



ha 



stances, when the archegonium seemed about ready to open, an 

 appearance was observed that looked ver>- much Hke the formation of 

 a true polar body, and was not to be compared with the ventral canal 

 ceU. He suggests that this structure, Kke the polar body, may be 

 derived from the division of the nucleus of the egg, his reason for 

 the suggestion being the aoDarpnt HTmrnntiVn r^f t^^ r,^^Af^^^<^ nf the 



ma 



the appearance of the structure 



actual division was not observed. 



In Onoclea Saw states that before the archegonium op. 

 egg IS depressed above, and the nucleus of the egg is flattened 

 the pressure caused by the swelUng of the waU of the ventral ca 



the 



A 



■^% 



the archegonium opens and 



the neck canal cells are expelled, the tgg becomes turgid. After the 

 sperm has entered the egg at the receptive spot, the egg coUapses, and 



this 



penetration of more than one 



sperm. Mottier ,67) expressed some doubt whether the coHapsed 

 appearance is reallv normal . 



In Pteris STR.4SBLTRGER (S3) observed the forma 



