Coleochaete irregularis Pringsheim 1860, p. 11 

 PL 17, Figs. 8, 9 



Thallus discoidal and monostromatic, with horizontal, branched 

 filaments spreading irregularly; usually free but sometimes adjoined 

 laterally for a short distance; ending so that a circular disc with 

 regular outline is formed. Cells quadrangular, 15-20/a in diameter. 

 Oogonia (including cortex) 40-65/x, in diameter. 



Common on aquatic vegetation and large filamentous algae in 

 several soft water lakes, acid swamps, and SpJmgnum bogs. Mich., 

 Wis. 



Coleochaete Nitellarum Jost 1895, p. 433 

 PI. 18, Figs. 1, 2 



Thallus composed of irregularly branched filaments of rectangular 

 or polygonal cells within the membranes of Nitella and Chara 

 (sometimes epiphytic also). Filaments sometimes adjoined laterally 

 to form a continuous expansion, but usually anastomosing and 

 spreading. Setae few, projecting externally through the membrane 

 of the host. Cells 11-20/x in diameter. Oogonia orbicular. 



Common; nearly always found in collections of Nitella; especially 

 evident and easy to study when the host plants are allowed to 

 deteriorate slightly. Mich., Wis. 



Coleochaete orbicularis Pringsheim 1860, p. 11 

 PI. 18, Figs. 3-5 



Thallus forming a regular, circular, monostromatic disc of branch- 

 ing filaments radiating from a common center and adjoined laterally. 

 Cells quadrangular, 12— 15/a in diameter, 12— 20/i, long. Oogonia 

 ovoid or subglobose, 45— 65/i, in diameter and up to 85/x in the long 

 dimension ( including cortex ) . 



For purposes of identification this species should be compared 

 with the more irregular thallus of C. scutata, which has larger cells. 



Common on submerged plant stems and leaves, and on shells. 

 Mich., Wis. 



Coleochaete pulvinata A. Braun in Kuetzing 1849, p. 425 



PI. 18, Figs. 7, 8 

 Thallus an epiphytic cushion of irregularly branched filaments 

 radiating from a common center. Cells oblong or pyriform, larger 

 at the anterior end; 25-40fi in diameter, 35-75/i, long. Oogonia 

 completely corticated, globose, 135-150;a in diameter (including 

 cortex). Antheridia flask-like, attached just below the oogonia or 

 nearby, on another branch. 



To be compared with C. diver gens Pringsh. 



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