Common; epiphytic on larger algae and stems of submerged 

 aquatics, in a variety of lakes. Mich., Wis. 



Coleochaete scutata de Brebisson 1844, p. 29 

 PI. 18, Fig. 9 



Thallus discoid, circular or reniform in outline. Filaments 

 compactly adjoined laterally, radiating from a common center. Cells 

 quadrangular, 22-46/x in diameter, 30-65/a long. Dioecious. Oogonia 

 subglobose with cortications above only; 145//, in diameter, 134/x 

 long. Antheridial cells in groups of 4 as a result of segmentation 

 of vegetative cells. 



Common in a variety of lakes, on plant stems, shells, glass, etc. 

 Mich., Wis. 



Coleochaete soluta (de Breb. ) Pringsheim 1860, p. 6 

 PI. 18, Figs. 6, 10, 11 



Thallus consisting of loosely spreading, branched filaments, radia- 

 ting from a common center and forming monostromatic expanses. 

 Filaments tapering very slightly, with bluntly rounded apical cells; 

 not adjoined laterally. Vegetative cells cylindric, 17-27/a in diameter, 

 50-75/x long. Mature oogonia globose, completely corticated, 100- 

 ISOju. in diameter. Antheridia flask-shaped, up to 17 fx in diameter. 



Attached to the culms of reeds and other submerged aquatics 

 in several lakes in northern counties; frequently found on bits of 

 decaying vegetation in Sphagnwn bogs. Mich., Wis. 



CHAETOSPHAERIDIUM Klebahn 1892, p. 276 



Plant consisting of a globose or flask-like attached cell from the 

 base of which a lateral cell is cut off, this passing through a tubular 

 elongation of the investing utricle to form another individual. Cell 

 inclosed by a colorless sheath which forms a neck through which 

 a long fine seta extends. Cells have 1 or 2 massive chloroplasts, each 

 with 1 pyrenoid. 



Key to the Species 

 1. Cells with 2 chloroplasts - -- C. ovalis 



1. Cells with 1 chloroplast — - - 2 



2. Cells solitary or clustered and inclosed by a common mucilaginous 

 sheath; individual cells usually not interconnected by mucilaginous 



tubes from their bases C. globosum 



2. Cells remote, or sometimes closely associated, but not inclosed 

 by a common mucilaginous sheath; adjoined from the base by 

 extensions of the utricle or cell sheath ._ - — C. Pringshcimii 



\ 130 1 



