.In Ecological Study of Buckeye Lake. 37 



tending is being invaded by oaks cbanging the bog to a meso- 

 phytic forest/-' 



The general character of the vegetation of the island is 

 that of a bog meadow surrounded by a border of trees, shrubs 

 and taller herbs, and this by a more or less complete marginal 

 marsh zone. (Fig. 13) The surface of the meadow is inter- 

 rupted by the presence of thickets of trees and shrubs, by Typha 

 clumps and by open ])ools. The shrub border is also much in- 

 terrupted by enclosed pools, marginal lagoons and coves. 



A critical study of the flora disclosed the presence of the 

 following associations. 



L Floating aquatics association, 

 n. Fixed aquatics with submerged leaves. 

 III. Semi-aquatic ]:)lants growing characteristically in 

 shallow water from 5^ feet to emergence on mud 

 flats at low water. 

 TV . Alarsh association. 

 A'. Bog-meadow association. 

 VF Heath or low shrub association. 

 \'TF l)Og-thicket or high shrub association. 

 \'IIF liog-forest association. 



L Free floating macroscopic plants. 



Spermatophyta wholly on the surface as the Femnaceae, 

 floating forms as L'tricularia minor, Pteriodi)hyta as the Salvin- 

 iaceae ; Bryo])hyta as Riccia and Ricciacarpus together with Al- 

 gae, the filamentous forms as Cladophora sp. and Spirogyra com- 

 prise the formation. 



The association occu])ies the shallow water at tlie margin 

 of the island and com])rises the ])rinci])al, often the entire vegeta- 

 tion of the pools l)oth marginal and enclosed, whetlier these ])ools 

 are in the shrub zone or in the bog-meadow. 



These plants are associated in various societies whose dif- 

 ferences expressed by the dominant sjjccies seem to be due to 

 (lift'erences in tlie depth of the water and the light exposure. 



