https://www.b-aqua.com/pages/PlantsFiche.aspx?id=1672
B-Aqua - Cycnogeton procerum
B-Aqua - Fiche descriptive : Cycnogeton procerum - Fiche descriptive de la maintenance de Cycnogeton procerum
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https://cal-invasives.net/species/leptographium-procerum.html
Leptographium procerum | Invasive Species List and Scorecards for California
invasive specieslistscorecardscalifornia
https://fair.unifg.it/handle/11369/3391
THREE NEW SPECIES OF LEPTOGRAPHIUM FROM PINE, SIMILAR TO L. PROCERUM
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