152 Lake Maxinkuckee, Physical and Biological Survey 



found growing quite abundantly and constantly in the mouth of the 

 small creek under the railroad bridge at Culver. In its habits of 

 reproduction one of the most striking of the algae, not differing in 

 manner from Pediastrum but on such a large scale that the phe- 

 nomenon is striking, the whole mass giving birth to minute colonies, 

 the adult form in miniature. In time of freshets, these minute 

 new-born colonies may be washed out a considerable distance into 

 the lake when they become a part of the plankton, but their normal 

 habitat is near the shore of lakes, although they may cover thickly 

 the entire surface of small ponds, forming dense masses. 



In 1906 (July 21) it was noted as being very abundant near 

 Chadwick's. 



43. GONIUM PECTORALE Miiller 



Not common ; one example found in the Outlet, August 13, 1906, 

 a 16-celled colony. Diameter 38 mic., individual cells 10 mic. in 

 diameter. Crenobium in active motion when observed. 



44. CHLAMVDOMONAS RETICULATA Gorosch 



Occasional in plankton hauls in July and August; found in the 

 plankton far out in the lake. 



45. DESMIDIUM SCHWARTZII Agardh 



Rare in the lake, obtained only once in a shore gathering of 

 heterogeneous material. 



46. DESMIDIUM QUADRATUM Nordstedt 



Common in Hawk's marsh where it grows among other fila- 

 mentous algae in the form of long filaments. Obtained September 

 14, 1906. Almost all algal gatherings from Hawk's marsh con- 

 tained this form in abundance. 



47. STAURASTRUM BREBISSONII Archer 



Taken in several plankton hauls and evidently found farther out 

 from shore than most desmids. A fairly common element in mus- 

 sel food. 



Several other forms of Staurastrum were encountered in the 

 mussel food, but were not identified. 



48. COSMARIUM GRANATUM Brebisson 



Only a few obtained in shore gatherings of miscellaneous ma- 

 terial. 



49. COSMARIUM LATUM Brebisson 



Obtained in a mass of weeds (Naias and Chara) collected at 

 Long Point, near shore, July 24, 1906. 



