96 



of Little Long Pond the great number of Blue Green Algae 

 would lend to disappear. This seems to have been already- 

 accomplished. The two lakes "bloomed" freely in 1921, slightly 

 in 1922 and not at all in 1923 or 1924. Of course there were 

 floating algae of various kinds in the lakes but nothing ap- 

 proaching the conditions of a "bloom." In the two lower 

 lakes there are a few areas where considerable amounts of 

 Oscillatoria are found on the bottom in August but none of this 

 was noticeable in First Lake. If this indicates a decrease in the 

 amount of organic matter in the lake water and an approach 

 to what may be considered the normal composition, it suggests 

 that some plants which have not secured a foothold in these 

 lakes may find suitable conditions in the next few years and 

 become established there. That the nature of the bottom can 

 not be the chief restricting factor is evidenced by the abundant 

 growth on the submerged shores of Little Long Pond. 



The plants collected during the past three years are the fol- 

 lowing: 



Plants found in all three lakes 

 Typha latifolia L., not abundant on any of the shores. 

 Sparganium eurycarpum Engelm., common on all the lakes. 

 Potamogeton heterophyllus Schreb. Forma graminifolius (Fries) 



Morong, common in First and Second Lakes, a few widely 



scattered plants in Third Lake. 

 Najas flexilis (Willd.) Rostk. & Schmidt. Very common in 



shallow water. 

 Elodea canadensis Michx. Common in Second and Third Lakes, 



formerly common in First Lake. 

 Vallisneria spiralis L. A few plants in water from two to four 



feet deep in all lakes. 

 Eleocharis acicularis (L.) R. & S. Common about the shores and 



in water up to a foot in depth. 

 Pontederia cordata L. Common about First Lake, only four 



plants found on Second and one on Third Lake. 

 Nymphaea advena Ait. Not uncommon in First Lake, few in 



the others. 

 Castalia odorata (Ait.) Woodville & Wood. Common in First, 



few in Second and only two plants in Third Lake. 

 Brasenia Schreberi Gmel. Common in First Lake, a few in most 



parts of Second, common near inlet of Third. 



