CHROOCOCT'US. 335 



On moist rocks, and other wet places. 

 Plate COX, figs. 40, 41. 



CHROOCOCCUS RUFE&CENS, (Breb.) Naeg. 



Stratum mucous, brown- yellow ; cells spherical, or oblong, 

 2-4 consociated into families. Tegument colorless; eytio 

 plasni finely granular, reddish, or yellowish brown. 



Diameter of cells, 12-16 /*. 

 Moist rocks. 



Syn. Pleurococcus rufescens, Breb. ; Protococcus rufescens, Kg. 

 Plate OCX, fig. 43. 



CHROOCOOCUS COHCERENS, Naeg. 



Cells oblong ; twin, or in fours with a distinct hyaline 

 tegument. Cell membrane thin. Oytioplasm blue-green. 



Diameter of cells, 3-6 j*. 



Syn. Protococcus coliorrens, Kg.; Pleurococcus coha'rens, Breb.; 

 C. refractus. Wood. 

 On damp walls, rocks, etc. 

 Plate OCX, fig. 42, different forms and sizes of cells. 



CHROOCOCCUS THERMOPHILUS, Wood. 



These cells were found in connection with Hydrurus occi- 

 dentaliSj Harv. (Nostoc calidarium, Wood) and are probably 

 the macrogonidia of Hydrurus. 



Benton Springs, Owen's Valley, California. 



22 



