174 Lake Maxinkuckee, Physical and Biological Survey 



middle of the internode and make an oblique ring. The end of the 

 leaf is peculiar, the corticated portion ending- abruptly with a 

 circle of knobs, and beyond this extends a curved cone consisting 

 of 2 or 3 rather large cells diminishing in size from base to apex. 

 The terminal cell is sometimes cuspidate, more often acutish. 



18. WATER-WEED; DITCH-MOSS; WATER-THYME 



PHILOTRIA CANADENSIS (Michaux) 



Widely distributed in deep waters, having been dredged at a 

 depth of 22 feet. Abundant in some places in shallow water where 

 it forms dense patches. There are good patches near the railroad 

 bridge at Culver and by the pier near the Outlet. It was found 

 near Norris Inlet and with other weeds forms a dense patch along 

 shore by the Culver Military Academy grounds. It seems to be 

 increasing in the lake and within late years an immense and very 

 dense patch has formed along the north shore of Long Point, by 

 Chadwick's pier. 



Many of the patches appear to die down completely during the 

 winter, others remain green. The elongate pistillate flowers are 

 delicate, curious objects, and are produced throughout the sum- 

 mer. The floating staminate ones are hard to find and but few 

 were seen. The plant is exceedingly variable in general form 

 and compactness, some being quite loose and long-jointed with 3 

 leaves in a whorl, others quite dense and compact with 4 or 5 

 leaves in a whorl. Some dense off-shoots probably serve as propa- 

 gating buds. This plant, which has been introduced into Europe, 

 is said to be a great nuisance there in rivers and bears the name 

 of water-pest. It has been reported also that in Europe it propa- 

 gates exclusively by vegetative propagation, only the pistillate 

 plants having been introduced. 



19. FENNEL-LEAVED PONDWEED ' 



POTAMOGETON PECTINATUS Liniiseus 



One of the most common pondweeds in shallow water near 

 shore, the general fan-shaped arrangement of the narrow, thickly 

 crowded leaves making it quite attractive. It was frequent to a 

 depth of 10 feet and was occasionally dredged 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 numerous places where it was noted may be 

 mentioned Long Point, McSheehy's pier, in front of the Barnes 

 cottage, off from the Depot grounds and east of there, along shore 



