Numerous small white flowers were observed on the lake surface in an area of water with average depth of 3 feet. The flowers were from Longbeak Buttercup (Ranunculus longirostris). I am not sure what circumstances encouraged the growth of this aquatic plant, but it certainly was the largest and most intense bloom during the past six years.
(Photographed June 8, 2020, lower Chemong Lake, Emily Township, Kawartha Lakes, Ontario, Canada)