Another duckweed picture. This time UV-induced fluorescence (UVIF). Nikon Z7, 60mm f/2.8 Micro, Nichia LED. Approx. 1:1 (life-size).
The duckweed community here comprises Spirodela polyrhiza (largely dead this time of the year), its turions (very much alive as they are starch-filled and will eventually sink to the lake floor to overwinter there), Lemna minor, L. minuta, and numerous seeds of a wetland plant I believe is Filipendula ulmaria.