144 Lake Maxinkuckee, Physical and Biological Survey 



As a general thing the Oscillatorias grow on wet ground form- 

 ing dense mats along the shores of rivers and lakes. With a 

 sudden rise of the water they are lifted loose and float until they 

 find suitable resting places. In August, 1906, Oscillatoria, prob- 

 ably this species, was observed forming a firm bottom stratum on 

 the bottom where the road north of Green's marsh passes along 

 the lake shore. 



16. OSCILLATORIA MAJOR Vaucher 



A large, stiff, straight Oscillatoria, probably this, was abund- 

 ant (August 6, 1906) on mud at the edge of the lake and in shallow 

 water, along the northeast shore of the lake where the public high- 

 way borders the lake. 



17. LYNGBYA ^ESTUARII Liebman 



The Lyngbya found at Lake Maxinkuckee is the form described 

 by Walle as L. obscura, which is regarded as a synonym of 

 sestuarii. It is an almost constant element in the vertical plank- 

 ton hauls made at the stations. While not generally conspicuous 

 in the plankton scum it sometimes collects pretty thickly along shore 

 in sheltered places, among rushes on calm days. It is not nearly 

 so common at Lake Maxinkuckee as at Winona Lake near War- 

 saw, where it was seen diffused through the water in great quan- 

 tities, resembling stiff hair-clippings. 



In addition to. being obtained in the vertical hauls, this was 

 often taken in the towing-net; it was also often simply skimmed 

 off of the surface of the lake when it formed masses of scum along 

 shore. In this manner quantities were obtained August 28, 1900, 

 and again on August 29, the material obtained August 29 being 

 dark brown in color, due to its condition, the sheaths frequently 

 projecting beyond the cells, some of the latter having escaped. Au- 

 gust 31, 1900, large patches of blue-green scum washed up against 

 the west shore of the lake proved to be composed of this. On the 

 afternoon of September 1, large, brown filaments of this were found 

 covered with diatoms. On September 4 there was a brown scum 

 near Arlington Hotel composed of this, Anabsena, Microcystis and 

 Statoblasts. A thick scum was also observed September 13 and 

 18. None was observed during the spring of 1901, it being more 

 abundant and conspicuous in the autumn. In the late summer and 

 autumn of 1906, hauls were frequently made with the towing-net 

 from the Chadwick pier across to the ice-office. On July 26, when 

 first observed, it was noted as not rare in a scant haul made. It 

 was actively forming hormogonia, or breaking up into reproductive 

 fragments, but not present in appreciable quantities in the lake. 



