58 Proceedings of the Ohio- State Academy of Science. 



folium var. versicolor, and Oxycoccus macrocarpus, species of 

 the bog-meadow and Alnus rugosa and Aronia arbutifolia of the 

 bog-thicket occur. 



VI. Bog-thicket association. 



The bog-thicket zone is the most conspicuous feature of the 

 island. The bog-meadow is surrounded on all sides by the thicket 



Fig. 22. — Gaylussacia resinosa society at margin of and extending into the 

 thicket. The belt transect Fig. 26 was taken through this society. 



and trees. From all approaches the island presents the appear- 

 ance of being densely wooded. It is the most gregarious and 

 complex association, being composed of characteristic bog plants 

 as Rhus vernix, Aronia, Ilex, bog ferns and mosses, together 

 with a large addition of swamp species as Rosa Carolina, Pel- 

 tandra virginica, Triadenum virginicum, Impatiens biflora and 

 others ; besides these, Alnus rugosa is very abundant. There are 



