Bogs, Their Nature and Origin. 



59 



laurel (Kalmia latifolia), high bush blueberry, blueberries 

 (Vaccinium nigrum, V. pennsylvanicum, V. canadense), service- 

 berry, sweet fern (Comptonia asplenifolia), sheep-laurel, choke- 

 berry, bracken fern, wintergreen (Gaultheria procumbens) , trail- 

 ing arbutus, cow-wheat (Melampyrum americanum) , bristly sar- 

 saparilla and lady's slipper (Cypripealdium acaule). 



The last stages of the morainic bogs on the Pocono Plateau 

 are found in some of the kettle holes that occur in the great 

 terminal moraine. These depressions are filled with a ground 



Fig. 5. Details of southeastern shore of Half Moon Lake, showing spattrr-dock in 

 water and bog in foreground. Note scattered larches. 



soil composed of peat and hair mosses out of which large trees 

 grow, such as black spruce, red maple, pitch pine, sour gum, 

 bird cherry, sassafras, great bay, trembling aspen, white birch, 

 and such shrubs as high bush blueberry, leather-leaf, sheep- 

 laurel, black alder, rhodora, mountain holly, together with such 

 ferns as cinnamon fern (Osmunda cinnamomea), hay scented 

 fern (Dicksonia piloliuscula) , bracken (Pteris aquUina) and 

 marsh shield-fern (Dryopteris thcly pteris) . Here grow also such 



