CONFERVA. 143 



CONFERVA ABBREVIATA, Bab. 



Small caespitose tufts, attached, green, but often discolored, 

 ferruginous ; articulations short cylindrical, not constricted 

 at joints, nor swollen ; cells before division not exceeding two 

 diameters ; usually as long as broad. Cell membrane thin, 

 hyaline, homogeneous ; chlorophyl evenly distributed. 



Diameter, 6-7 \ ^ 

 Syn. Conferva floccosa ochracea, Kg. ; Conferva ochracea, Kg. 



Character of this species very near that of C. punctalis, but 

 as a rule the cells are shorter and slightly thinner. The 

 color, often ochraceous, or ferruginous may be ascribed to 

 the character of the soil of the basin, rather than to a 

 character of the plant. 



Plate CXXI, figs. 18, 19 ; these figures drawn for C. punc- 

 talis may also represent a state of C. abbreviata. 



CONFERVA TENERRIMA, Kg. 



Usually pale green, often in colorless masses ; articula- 

 tions lij-2-3 times longer than the diameter. 



Diameter of filaments, 3.5-4 //, (3-5 //, Kirch.). 



Ponds, Florida; and northward, in smaller quantities. 

 Plate CXX, figs. 1, 2. 



CONFERVA GLACIALIOIDES, Wolle. 



Very pale green, filaments long, laxly interwoven, prim- 

 arily attached, thin, floating in cloud -like masses. Diameter 

 of filaments 4-5. 5 ^ articulations 4-9 times as long as broad. 

 Springs, Pennsylvania. 



Very near C. glacialis, Kg., but articulations average twice 

 as long. 



Plate CXX, figs. 5-8. 



CONFERVA RHYPOPHILA, Kg. 



Green, often ferruginously colored, thin ; cells ante divi- 

 sion, 3-4 times as long as wide. 



Diameter of filaments, 4.3-5 //. 



Small pools, from Pennsylvania to Florida. 

 Plate CXX, figs. 3, 4. 



Genus 28, CHAETOMOBPHA, Kg. 



Articulate filaments simple, nearly equally thick, fixed by a 

 discoid, or root-like, divided, base ; lower articulations always 



short ; before division equal or somewhat longer, after division 

 10 



