Lake Maxinkuckee, Physical and Biological Survey 213 



During- the summer the resistance offered by the ample foHage 

 of this plant to the movement of the water has a pronounced 

 effect during storms. The water surface over a patch of this 

 species is often quite calm while the surrounding surface is con- 

 siderably ruffled. 



33. RIVER PONDWEED; LONG-LEAVED PONDWEED 



POTAMOGETON AMERICANUS Cham. & Schl. 



The long-leaved pondweed is common in small patches about the 

 lake, especially in shallow water near shore. It thrives well in 

 sandy bottom. The floating leaves considerably resemble those of 

 P. natans but are longer and narrower; the submersed leaves are 

 translucent, and wavy-edged. Among the numerous localities near 

 shore where this plant was found are, — a patch in sand in front 

 of the Scovell cottage, and some in a lagoon on Long Point flat. It 

 grew thickly along shore by the swamp below Farrar's, and there 

 was a good deal at the beginning of Overmyer's woods, and a large 

 patch opposite the green boathouse. It was very abundant in the 

 thoroughfare between the lakes, and here the leaves were exceed- 

 ingly elongate as if pulled out by the force of the swiftly flowing 

 water. All the way down the outlet it grew, in dense, leafy patches, 

 the long-crisped leaves vivid green all winter through and waving 

 like flapping flags in the passing current. It grows also in Tippe- 

 canoe and Yellow rivers and is the Potamogeton usually found in 

 streams and rivers. 



P. americanus frequently grows on wet sand banks at the 

 water's edge, wholly out of the water. In this case it is much 

 changed in appearance, being short and leafy, and all the leaves of 

 a firm leathery texture, much in substance like the floating leaves 

 of the aquatic plant. 



34. VARIOUS-LEAVED PONDWEED 



POTAMOGETON HETEROPHYLLUS Schreb. 



An odd-looking pondweed, rather unlike the others in general 

 appearance, and confined principally to the shallower water along 

 shore, although we have a few records of its having been dredged 

 up in deep water. The most noteworthy patch was out a few hun- 

 dred feet from the Scovell cottage ; scattered plants were also found 

 along shore in the shallow water just off Long Point, and it was 

 frequently found in the northern part of the lake. It keeps its 

 form all winter, the leaves turning purplish brown. 



