216 Lake Maxinkuckee, Physical and Biological Survey 



41. FILIFORM PONDWEED 



POTAMOGETON FILIFORMIS Pers. 



This, like P. piisillus, is a small, inconspicuous form that' would 

 generally escape notice on account of its small size. It was noted 

 m flower down by Norris Inlet June 24, 1901, and had been seen 

 in flower in the northern part of the lake some time before. Scat- 

 tered plants grow throughout the lake bottom in water ranging 

 from 2 to 24 feet in depth. 



42. FENNEL-LEAVED PONDWEED 



POTAMOGETON PECTINATUS L. 



This is one of the most common pondweeds in the shallow water 

 near shore. It was frequent to a depth of 10 feet and was occa- 

 sionally dredged up in 16 feet of water. It was noted everywhere 

 along the beach growing in either sandy or muddy bottom and in 

 rather dense patches by itself or among Chara. Among the nu- 

 merous places where it was noticed may be mentioned Long Point, 

 McSheehy's pier, the Barnes cottage, off the Depot grounds, and 

 east of there, by the green boathouse, by Norris Inlet, etc., and 

 a fine patch grew at the head of the thoroughfare above the 

 wagon bridge. The plants frequently grow out in long straight 

 rows from. shore, the different stems coming up in line from a white 

 strong rootstock. 



The individuals of this species which grow close to shore die 

 down during the winter. In deeper water, though much of it re- 

 tains its form during the winter, a little handling or raking shows 

 that the plants have decayed and come apart at a touch; certain 

 bits, however, perhaps tips of the stems, seem to remain green and 

 alive and can be found detached now and then. 



The fennel-leaved pondweed bears a peculiar propagating tuber 

 consisting of a series of gall-like starch-containing objects, ar- 

 ranged one in the axil of the other, and each bearing a rather long 

 curved beak-like bud. These do not seem to be wintering-over 

 buds; they are formed even in midsummer by portions of plants 

 which have been broken off. These buds are, however, seen most 

 frequently during autumn and winter. Bulbs were observed on 

 broken off bits October 27, December 1, 1904, and later. They 

 were frequently observed on fragments washed ashore, or on broken 

 pieces seen under the ice during the winter. 



More than any other of the pondweeds of the lake, this species 

 becomes the place of attachment of various sorts of organisms. 

 Throughout the summer the plants are in places almost encrusted 



