488 BOTANICAL GAZETTE [December 



* 



female gametes of Cutleria are capable of developing into the flat- 

 tened disk like Aglaozonia in nature. Though at first their external 

 morphology presents irregular deviations from forms in nature, 

 the nuclear divisions are perfectly normal. The culture of the 

 sporelings was not continued up to production of reproductive 

 organs, and consequently the discussion cannot be carried on any 

 further. This apogamy may indeed be a reversion to the ancestral 

 type of asexual spores which certainly existed before the appear- 

 ance of sexuality in the gametophytic generation, but when 

 sexuality is once established, the fusion of gametes and thereby the 

 sporophytic generation is interpolated as a secondary structure 

 in which the reduction of chromosomes occurs. 



Summary 



may be summarized 



history of Cutleria mtdtifid 



male and female 



chromosomes, and the male and female gametes 



number 



number is doubled, and 



chromosomes appear in the sporelings, which develop into the 

 Aglaozonia form of Cutleria. Therefore, the individual bearing the 

 name of Cutleria multifida represents the gametophytic phase of 

 the species, 24 being the gametophytic number of chromosomes; 

 and the Aglaozonia form of Cutleria represents the sporophytic 

 phase, 48 being the sporophytic number. 



3. Aglaozonia reptans contains 48 chromosomes, and the number 

 is reduced in zoospore formation, the zoospore containing 24 



chromosomes 



number 



somes germinates without conjugation. The individual grown 

 from the germinating zoospore presents a striking similarity to the 

 young form of Cutleria in nature and contains 24 chromosomes, 



same number 



the 



'pt 



numbe 



chromosomes, and that the gametophytic phase is represented 



