Didymo
Didymo

Didymosphenia geminata Photo credit: Brad Taylor

Didymo
Didymo

Didymosphenia geminata Photo credit: B.Beltran - J.Butt (Pennsylvania Department of Environmental Protection)

Didymo
Didymo

Didymosphenia geminata Photo credit: Michel Chouinard

Diatoms

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.

*Status column last updated in August 2016.