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Rusty underside of a leaf of northern oak fern ...

Rusty underside of a leaf of northern oak fern  ...

Rusty underside of a leaf of northern oak fern Gymnocarpium dryopteris affected by a fungal disease fir-oak-fern rust ... north from Saint Petersburg. Russia, July 14, 2017

Toksovo near Saint ... 2017
Browse current photo album: Toksovo near Saint Petersburg, Russia, July 14, 2017
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