54 Proceedings of the Ohio State Academy of Science. 



wards the east side of the meadow adjacent to the thicket associa- 

 tion in hummocky Sphagnum is quite an area of Carex fiHformis 

 associated with Oxycoccus macrocarpus and Sphagnum cymbi- 

 folium. Its characteristic tall slender culms and filiform involute 

 leaves are in sharp contrast to the sedges of adjacent societies. 

 There is a similar area on the southwest portion of the island. 



5. Oxycoccus-Sphagnum-Carex interior society : — Carex 

 interior, a slender narrow-leaved low plant with strongly marked 

 caespitose habit, is the dominant sedge in areas near the shrub 

 border. 



6. Sphagnum-Carex limosa society : — In a small shallow 

 pool not more than 40 square feet in area, on the north side of 

 the meadow is an almost pure growth of Carex limosa. The 

 bottom and sides of the pool are lined with Sphagnum acuti- 

 folium. Carex limosa has here the prostrate creeping rooting-at- 

 the-nodes habit of C. chordorrhiza. Carex limosa occurs in 

 abundance in also another portion of the meadow under quite 

 different conditions. The Sphagnum is very hummocky, there 

 are numerous shrubs, other sedges as Dulichium, Rynchospora 

 and Eryophorum, also Alenyanthes trifoliata and Pogonia ophio- 

 glossoides. The Carex flowers and early matures its seeds ; the 

 brown pendulous spikes are quite unlike those of any other 

 sedges associated with it. Later, after the seeds have fallen, the 

 spikes disappear and then the presence of Carex limosa can 

 scarcely be detected among the other plants. 



Eryophorum virginicum (cotton grass) tall and particularly 

 striking in late summer when the inflorescence is a white 

 plumose mass, is also very abundant especially in the Dulichium 

 and Rynchospora societies. 



In the southwestern portion of the island, where marginal 

 coves are large, inland pools numerous, and the water level is 

 generally high, Dryopteris thelypteris associated with Oxycoccus 

 and Sphagnum cymbifolium and S. acutifolium covers quite a 

 large area of the open bog. 



In the same portion of the island, but closer to the pools, 

 Sagittaria latifolia has become very abundant. 



