Chrysocapsa planctonica (West & West) Pascher 1913, p. 85 



[Phaeococcus planctonicus West & West] 



PI. 99, Fig. 8 



A free-floating colony of globose or subglobose cells in some 



multiple of 2, up to 64; colonial envelope hyaline, homogeneous, or 



with radiating fibrils of mucilage; chromatophores 1-2 golden-brown, 



parietal plates which may completely cover the cell wall; cells 



7.2-9.6/i, in diameter; colonies up to 250/* in diameter. 



Common in the plankton of many lakes, both hard and soft 

 water. Mich., Wis. 



ORDER CHRYSOSPHAERALES 



In this order the organisms are unicellular and the protoplasts 

 are inclosed by a firm wall of a hard material, the composition of 

 which is apparently unknown. The cells are incapable of division 

 in the vegetative state and in this respect are comparable to the 

 Chlorococcales in the Chlorophyta. In most forms reproduction 

 occurs by the formation of 2 or more individuals within the parent 

 cell in which they may remain for a short time; typical colony 

 formation, however, is not known for this group. Zoospore formation 

 has been observed in some. 



FAMILY CHRYSOSTOMATACEAE 



Characters as described for the order. This is a little-understood 

 group of organisms which are cyst-like in character. The wall is 

 impregnated with silicon and is variously extended to form slender, 

 radiating, simple or forked, processes. There is an aperture or plug 

 at one end. The chromatophores are yellow-brown and parietal and 

 the food reserve is in the form of oil droplets (probably leucosin 

 is formed also ) . 



CHRYSOSTRELLA Chodat 1921, p. 86 

 Characters as described for the family. Cells free-swimming 

 (floating ?), globose or subglobose with a firm membrane (possibly 

 impregnated with silicon) in which there is an apical flagellum 

 opening; chromatophores 2, plate-like parietal bodies; stored food 

 in the form of numerous oil bodies. 



Chrysostrella paradoxa Chodat 1921, p. 86 

 PI. 97, Fig. 8 

 Cells globose, with a thick, firm membrane which bears a number 

 of radiating processes, either simple or dichotomously divided near 



[385] 



