iQi2] YAMANOUCHI—CUTLERIA 489 



by the individual grown from the zoospore and resembling the 

 young form of Cutleria in nature. It is certain that Aglaozonia 

 reptans as it occurs in nature is identical with the Aglaozonia form 

 of Cutleria multifida as developed in cultures and now determined 

 to be the sporophytic phase of the species. 



4 



ultifida and Aglaozonia rept 



game 



single species, the two generations alternating in the life history of 

 Cutleria . 



5. The female gamete of Cutleria may germinate apogamously. 



There is no irregularity in the mitotic process, 24 chromosomes 



being invariably present. The individual produced, in its early 



development differs somewhat from the product of the fertilized 



gamete, but the fate of the apogamous individual was not deter- 

 mined. 



University of Chicago 



LITERATURE CITED 



1. Allen, C. E., Nuclear division in the pollen mother cells of Li Hum cam- 

 dense. Ann. Botany 19:189-258. pis. 6-g. 1905. 



2. Berghs, J., Formation des chromosomes heterotypiques dans la sporo- 

 genese vegetale. 1. Depuis le spireme jusqu'aux chromosomes murs dans 

 la microsporogenese d'Allium fistulosum et de Lilium lancifolium (specio- 

 sum). La Cellule 21:173-189. pi. 1. 1904. 



3- , Le noyau et la cinese chez le Spirogyra. La Cellule 23:55-86. 



pis. 1-3. 1906. 



4« Bower, F. O., On antithetic as distinct from homologous alternation of 



generations in plants. Ann. Botany 4:347-37°- l8 9°- 

 5« Celakovsky, L., Uber den dreifachen Generationswechsel der Pilanzen. 



Sitzungsber. Bohm. Gesellsch. 1877:151-160. 

 6. Church, A. H., Polymorphy of Cutleria multifida. Ann. Botany 12:75- 



109. pis. 7-p. 1898. 

 7- Crouan, P. L. and H. M., Observations microscopiques sur l'organisation , 



la fructification, et la dissemination de plusieurs genres d'algues apparten- 



ant a la famille des Dictyotees. Bull. Soc. Bot. France 4*24-25- l8 57- 

 8. Davis, B. M., Kerntheilung in der Tetrasporenmutterzelle bei Corallina 



officinalis L. var. mediterranea. Ber. Deutsch Bot. Gesells. 16:266-272. 



pis. 16, 17. 1898. 

 9« — v Spore formation in Derbesia. Ann. Botany 22:1-20. pis. 1, 2. 



1908. 



