April, 1908.] 
The Vegetation of Cedar Point. 
333 
Facies: Potamogeton perfoliatus, 
Potamogeton lonchites, 
Potamogeton pusillus. 
Principal Species: 
Vallisneria spiralis, 
Myriophyltum spicatum. 
Secondary Species: 
Potamogeton natans, 
Potamogeton amplifolius , 
Naias flexilis, 
Castalia tuberosa, 
Scirpus validus, 
Ceratophyllum demersum. 
Potamogeton foliosus, 
Potamogeton zosteriaefolius. 
Philotria canadensis, 
Nymphaea advena, 
Nelumbo lutea, 
Fig. 17. A Pontederia cordata Society along the submerged bar at the 
south end of Biemiller’s Cove. The Typha latifolia Consocies of the 
Phragmites-Typha Marsh Formation in the background. 
The mass of vegetation comprising this formation is altogether 
quite large and the water is often so thoroughly filled up with it 
that, looked at from above, the space appears completely taken 
up by the vegetation in the middle and lower depths. The con¬ 
ditions are very good for the accumulation of considerable de¬ 
posits of vegetable debris and for straining out suspended sedi¬ 
ments in the water, or for obstructing to some extent floating 
debris, so as to finally lead to its deposition on the bottom. Un¬ 
der conditions of stable equilibrium, as to the relative position 
of water level and the land, this formation could be expected 
