DigitalNatura.Org - Potamogeton pectinatus, Ceratophyllum demersum http://digitalnatura.org/details.php?image_id=2842 Mon, 13 Apr 2026 20:45:00 GMT http://digitalnatura.org/data/thumbnails/21/potaae_copia.jpg Potamogeton pectinatus, Ceratophyllum demersum http://digitalnatura.org/details.php?image_id=2842