336 



The Ohio Naturalist. 



[Vol. VIII, No. 6, 



structure only begins to show, but at the fruiting season of the 

 wild rice the habitat of the Casta! ia-Nymphaea formation is 

 conspicuously dominated by the Society. 



The Phragmiies-Typha Marsh Formation. 



In the more sheltered habitat afiforded around the cove this 

 formation differs from the formation as found in the marsh to 

 the west of the Bar Section in that the Typha latifolia Consocies 

 is more prominent. It appears from the writer's observations 

 that the Typha latifolia Consocies prefers a soil rich in humus 

 while the Phragmites phragmites Consocies, other conditions being 



Fig. 20. The Utricularia vulgaris Society in one of the larger inlets 

 running into the marsh at the north end of Biemiller's Cove. Typha 

 latifolia and Typha angustifolia Consocies in the background. Sctrpus 

 americana at the right. 



equal, prefers a more sandy substratum. On the submerged 

 sand bar which forms the southern boundary of Biemiller's Cove 

 the axis of the bar where about a foot under water is occupied by 

 the Phragmites phragmites Consocies, while towards the junction 

 of the bar with the mainland, where there is considerable humus 

 in the soil, the Typha latifolia Consocies appears. 



The composition of the formation as exemplified around the 

 coves is as follows: 



