48 . Proceedings of the Ohio State Academy of Science. 



plants or caespitose in only one or two situations and then gen- 

 erally at the extreme margin of the island or bordering a pool. 

 Carex decomposita is new to the state list. It occurs here in 

 two places, both on the east side of the island. The one is at 

 the extreme water's edge at the base of a dead alder on a small 

 island bordering the larger one, and the second is at the edge 

 of a lagoon surrounded by the b'og-forest. 



During the fall of 1909 the long southern lobe of the island 

 was cleared of trees and shrubs. During the following spring 

 and summer the area was covered with an exceedingly dense 

 growth of Alnus, Rhus, Salix and Acer shoots from the old 

 stumps together with a very large number of herbs, which with 

 the stronger light exposure had a much better chance to grow. 

 A large number of sedges and grasses grow in this cleared area, 

 and since it is open to invasion, certain plants were found grow- 

 ing here that could not be discovered anywhere else on the 

 island. Dianthera americana grows in such masses on the west- 

 ern border of the lobe as to dominate the zone over a small 

 area. Last August two plants of Onagra biennis were found 

 among the branches of a fallen maple.' This lobe was formerly 

 wooded to the water's edge at the south end with but a narrow 

 swamp border on the west and east sides. The water is quite 

 deep just to the south, and if the maps of the survey of 1801 

 and 1799 are correct, the bog was nearest the margin of the old 

 lake at this point. Aquatic plants are almost wanting. 



V. Bog-meadow association. 



The greater portion of the island is a Sphagnum Oxycoccus 

 bog, of which everywhere the dominant plants are several species 

 of Sphagnum and Oxpcoccus macrocarpus. (Fig. 18.) These 

 two are nearly always associated with other plants in such num- 

 bers as to form characteristic societies with them. 



The b'og-meadow corresponds to the High moor or Heide- 

 moore of Europe as described by Warming, ^'^ Schimper, ^- 

 Grabner, ■^- and Friih and Schroter.-® It is a formation accord- 

 ing to these authors, characteristic of high temperate latitudes 

 where the low temperature, abundant moisture with the exclusion 



