Ruud de Block:
Salvinia natans - Vlotvarentje - BG Meise
Ruud de Block:
Salvinia natans - BG Kopenhagen
Ruud de Block:
Salvinia natans - BG Kopenhagen-003
Ruud de Block:
Salvinia natans - BG Berlin01
Ruud de Block:
Salvinia natans - BG Berlin02
Ruud de Block:
Azolla caroliniana Willd. - BG Berlin
Ruud de Block:
Azolla caroliniana Willd. - BG Berlin
Ruud de Block:
Salvinia biloba Raddi - BG Berlin
Ruud de Block:
Salvinia biloba Raddi - BG Berlin
Ruud de Block:
Salvinia auriculata Aubl. - BG Meise
Ruud de Block:
Salvinia auriculata Aubl. - BG Meise
Ruud de Block:
Salvinia auriculata Aubl. - Meise
Ruud de Block:
Azolla filiculoides Lam. - Grote kroosvaren - BG Madeira
Ruud de Block:
Azolla filiculoides Lam. - Grote kroosvaren - BG Madeira
Ruud de Block:
Salvinia × molesta D. S. Mitch. - Grote vlotvaren - BG Madeira