Ceratophyllum demersum "Hornwort" – Pond Plants of America
Forests | Free Full-Text | Differential Effects of Desiccation on Hornworts with Contrasting Life Histories in Tropical Montane Forests: A Functional Trait—Based Perspective
Hornwort Biology and Systematics - Berkshire Environmental Action Team
A plant that looks like hornwort/ambuila but i dont think it is! | The Planted Tank Forum
Hornwort Bunched Aquatic Plant 3 Bunches - Etsy
Plans on eventually removing hornwort | Aquatic Plant Forum