How do ferns survive in salt marshes and other exposed places?

While most ferns are typically found in shaded, damp forests, certain species have adapted to survive in harsh environments like salt marshes and fully exposed sites.1

To thrive in these challenging conditions, terrestrial ferns—such as the leather fern (Acrostichum) in salt marshes or the bracken (Pteridium) in open areas—possess specific structural modifications. These adaptations are similar to those found in some desert plants and include:1

• Hard tissues and thick texture: These provide physical resilience against environmental stress.1
• Thick cuticle: A waxy layer on the epidermis helps minimize water loss.1
• Trichomes and scales: Abundant plant hairs or scales on the leaf and stem surfaces offer further protection.1

Even in species where the mature sporophyte can tolerate sun and drought, the gametophyte stage typically still requires a protected, humid microenvironment with minimal light, such as deep crevices or shaded soil, to develop successfully.1