FAMILY CHLOROMOEBACEAE 



CHLOROCHROMONAS Lewis 1913, p. 254 



Cells pyriform or cordate, with 2 flagella of unequal length at- 

 tached at the broad anterior end, which is sHghtly concave; cell 

 wall lacking; protoplast containing 2 elongate-ovate and somewhat 

 curved chromatophores; food reserve in the form of oil droplets and 

 a basal globule of leucosin; cells capable of becoming amoeboid, 

 attached by a posterior pseudopodium-like extension; pigment-spot 

 lacking. 



Chlorochromonas minuta Lewis 1913, p. 254 

 PL 93, Figs. 8-10 



Characteristics as described for the genus; cells 4.5-9.5;u, long. 



Culture from Lake Mendota, Wisconsin (Lewis). 



ORDER RHIZOCHLORIDALES 



These organisms have a plasmodial morphology. The protoplast 

 is naked but in some forms at least is inclosed by a definitely shaped 

 hyaline envelope or lorica. Although essentially uninucleate, a multi- 

 nucleate condition develops in older cells by repeated nuclear 

 division. The chromatophore is a thin, laminate disc. Reproduction 

 is by cell division or by zoospores. There is 1 family. 



FAMILY STIPITOCOCCACEAE 



Characteristics as described for the order. This group is composed 

 of forms in which variously shaped loricas are secreted about the 

 protoplast. This envelope is usually attached to a substrate by a 

 fine, thread-like stipe. The protoplast often shows 1 or more rhizo- 

 podal extensions, at least an apical one. In our collections the family 

 is represented by 1 genus, although organisms probably belonging 

 to a second genus, Wiizolekane, have been noted. 



STIPITOCOCCUS West & West 1898, Jour. Bot., 36, p. 336 



An attached unicell, housed in an envelope of various forms, 

 elliptical, pitcher-shaped, or ovoid, borne on a slender, thread-like 

 stipe which may have a basal attaching disc; chromatophores faintly 

 pigmented, yellow-green bodies, 1-3 in each cell; protoplast showing 

 a fine rhizoidal apical thread; attached to filamentous algae. 



Key to the Species 



1. Lorica pitcher-shaped when mature-— S. urceolatus 



1. Lorica not pitcher-shaped - ^ 



2. Cells globose with an apiculation S. apiculatus 



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