178 Lake Maxinkuckee, Physical and Biological Survey 

 26. INTERRUPTED PONDWEED 



POTAMOGETON INTERRUPTUS Kitaibel 



A small pondweed much resembling P. pectin atus, growing in 

 shallow water. Fomid near the Depot pier in the autumn of 1904. 

 In the winter the rootstocks are thickened into tuber-like objects 

 which are often uncovered by the waves which probably function as 

 agents of dissemination. 



27. WATER MARIGOLD 



MEGALODONTA BECKII (Torrey) 



Rather common in the lake; of irregular distribution. During 

 the autumn of 1900, there was a dense and quite large patch near 

 the Ice-houses, but during the following winter it disappeared. 

 Some of the plants remain green all winter — the tops break off, 

 and drift, sometimes into deeper and occasionally into shallow 

 water. They strike root at the basal end and probably catch and 

 grow. In plants of such a habit, the patches in the lake have no 

 permanent position, but may be found in one place one year and 

 another the next, according to where they have drifted and found 

 congenial conditions. This is one of the handsomest of our water- 

 plants. 



28. CARPET CHARA 



CHARA CONTRARIA A. Braun 



A stout species of Chara, growing about 8 inches high, form- 

 ing a dense mat over marly portions of the lake in water from 

 5 to 8 feet deep. It forms a covering over most of the bottom of 

 Outlet Bay out from Long Point, and, indeed, almost everywhere 

 in the lake where bottom and depth are favorable. It was scarce 

 or absent in shallow water from Norris pier over toward the eastern 

 shore, probably on account of the peaty bottom. It is among this 

 Chara that the small organisms of the lake, insect larvse, Asellus, 

 and the like find refuge, and here, too, the darters and small fishes 

 spend much of the winter. On account of the habit of this species 

 of forming a dense mat over the bottom it is generally referred to 

 as the Carpet Chara. 



29. LARGE YELLOW POND LILY 



NYMPH^A ADVENA Solander 



Distribution rather scattered in Lake Maxinkuckee, as it is fond 

 of shallow water and rich mud, and these places are only occasional 

 in the lake. It is found in the Outlet below the wagon bridge, along 



