Nitellopsis obtusa Photo credit: Jim Grazio, Pennsylvania Department of Environmental Protection (2015)
Prymnesium parvum Photo credit: FWC Fish and Wildlife Research Institute
Nitellopsis obtusa Photo credit: Kristian Peters-Fabelfroh 12:41, October 2006-Wikimedia Commons
Common: Species found in at least 1/3 of Pennsylvania counties.
Uncommon: Species found in Pennsylvania, but not widespread (i.e., found in less than 1/3 of Pennsylvania counties.)
Not present: Species not yet found in Pennsylvania.
Note: Species list updated in September 2021.