NO. 5 COLONIAL FORMATION OF GREEN ALGAE MEIER 1 3 



EXPLANATION OF PLATES 



Pl.ATK I 



Cystococcus cohacrcns var. (Xapprox. |) grown on Detmer ^-agar 2 percent- 

 dextrose 2 percent in intermittent light for one month. The algae in 

 plates 2 and 3 were cultured in a similar manner. 



Plate 2 



Chlorclla vulgaris, X approx. 4. 



Platk 3 



ChJorococcitm viscosum, X approx. \. 



(Figure numbers refer to both plates.) 



Fig. I. Intermittent light for 3 months. 



2. Intermittent light for i month, continuous light for 2 months. 



3. Intermittent light for i month, continuous darkness for 2 months. 



4. Continuous darkness for 3 months. 



5. Continuous darkness for i month, intermittent light for 2 months. 



6. Continuous darkness for i month, continuous light for 2 months. 



7. Continuous light for 3 months. 



8. Continuous light for i month, intermittent light for 2 months. 



9. Continuous light for i month, continuous darkness for 2 months. 



10. Continuous darkness for 3 months. 



11. Continuous light for 3 months. 



Fig. 1-9. Colonies on Detmer 3-agar 2 percent-dextrose 2 percent. 

 Figs, io-ii. Colonies on Detmer j-agar 2 percent. 



LITERATURE CITED 

 Artari, Alexander 



1899. Ueber die Entwicklung der griinen Algen unter Ausschluss der Be- 



dingungen der Kohlensaure-Assimilation. Bull. Soc. Imp. Nat. 

 Moscou, pp. 39-47. 



1900. Ueber die Entwicklung der griinen Algen unter Ausschluss der Be- 



dingungen der Kohlensaure-Assimilation. Bull. Soc. Imp. Nat. 

 Moscou, pp. 37-47. 

 1902. Ueber die Bildung des Chlorophyls durch grune Algen. Ber. Deutsch. 

 hot. Ges., Bund 20, pp. 201-207. 

 Arthur, John M. 



1930. Light and the green plant. Scientific Monthly, vol. 31, pp. 343-346. 

 C HOD AT, R. 



1913. Monographies d'algues en culture pure. Materiaux pour la Flore 

 Cryptogamique Suisse, vol. 4, fasc. 2, Berne. 

 Colla, Silvia 



1930. Formazione della clorofilla nelle piante exposte alia luce de Wood. 

 Annali di Botanica, vol. 18, pp. 329-349. 

 Etard, a., and Bouilhac 



1898. Presence des chlorophylles dans un Nostoc cultive a I'abri de la 

 lumiere. C. R. Acad. Sci., tome 127, pp. 119-121. 



