i6 University of Michigan 



TEMPORARY SWAMPS (TABLE II) 



Habitat i6. Szuamp in Floating Marsh. A partially flooded 

 area was found in the floating marsh surrounding Tamarack 

 Lake, on the northern side some distance back from the shore 

 line. In this the flora consisted of bladderworts, pitcher plants, 

 water-mosses, sundews, Galium claytoniana, Andromeda per- 

 folia and Carex filiformis and other sedges. 



Habitat ij. Beaver Meadotv. A short distance below the 

 beaver pond on Hancock Creek an extensive beaver meadow, 

 the site of a former beaver pond, had not as yet been grown 

 over by the surrounding thickets. This was covered with 

 grass, except in a few lower spots where ponds formed after 

 rains. These places were grown up with Carex lurina and 

 another large sedge and formed quite typical temporary swamp 

 habitats. The bottom was composed of decaying vegetable 

 material and was damp throughout the year. The dead speci- 

 mens of Planorbis trivolvis seem to indicate former more set- 

 tled conditions. 



Habitat i8. Szvamps on McKinnon Brook Flats. On the 

 flats of this brook, but probably too high above the stream 

 itself to be reached by floods, were numerous small swamps. 

 These were filled with an organic muck and formed small, 

 temporary ponds after heavy rains. Ashes, elms and balsam 

 firs were the most common trees over these flats, while Ascle- 

 pias incarnata and Marchantia polymorpha were the most 

 prevalent ground plants. 



Some of these ponds contained little organic material, but 

 others had a thicker layer and were grown up with Equisetum 

 and other amphibious plants. These latter pools were in the 

 damper places and had not been so badly afifected by the fire 

 as those nearer the edge. 



