84 College of Forestry 
VEGETATION. 
Water Willow (Dianthera ameri- Swamp Loosestrife (Decodon verti- 
cana). cillatus) . 
Broad-leaved Arrow-head (Sagit- Sedge (Carex trichocarpa). 
taria latifolia) . 
ANIMAL LIFE. 
MOLLUSCA. 
Vivipara contectoides, abundant. Goniobasis livescens, rare. 
Campeloma integrum, rare. Planorbis campanulatus, rare. 
Station XXXV. Center oF Ovrier, Mopirrep By 
CanaL (Fretp No. 237). East or 
Davison’s Lanpine. 
Borrom: Fine sand. Water: 3-5 feet deep. 
The vegetation is divisible into two classes, aerial and sub- 
merged (figure 30, page 104). 
AERIAL VEGETATION, 
This type of vegetation grows in water from 3 to 5 feet 
in depth, and forms several islands where the plants are 
massed. These islands exhibit a typical zonal disposition of 
plants, each type surrounding a central core in a complete 
circle. One of these islands, situated a few hundred feet 
northeast of the cemetery at Brewerton may be taken as 
typical of these island-like plant associations (Fig. 30). In 
the center the water is but a few inches deep and there is a 
growth of Sedge (Carex trichocarpa); surrounding the 
Carex is a heavy growth of Water Willow (Dianthera amerv- 
cana) followed by a ring of Lake Bulrush (Sctrpus occiden- 
talis). In the center of the south side a bay-like indentation 
occurs, which is protected from the rough water by the heavy 
mat of vegetation, and in this spot are a few Cow Lilies 
(Nymphea advena), Sweet-scented Water Lillies (Castalza 
odorata), Floating Pond-weed (Potamogeton natans) and 
Broad-leaved Arrow-head (Sagittaria latifolia). 
