Áthidalt

Áthidalt, also known as the "Irish Seaweed" or *Ulva lactuca*, is a genus of green algae commonly found in coastal marine environments across the world, including the Atlantic Ocean, Pacific Ocean, and Mediterranean Sea. Within Ireland, it is particularly prevalent along rocky shores and intertidal zones, where it thrives in both freshwater and saltwater habitats. The name *Ulva* derives from the Latin word for "leaf," reflecting its broad, leaf-like fronds that can grow up to several meters in length.

This algae is widely recognized for its nutritional and medicinal properties. It is rich in vitamins (such as A, C, and K), minerals (including iodine, calcium, and magnesium), and bioactive compounds like antioxidants and anti-inflammatory agents. Historically, *Ulva lactuca* has been used in traditional medicine for treating ailments such as digestive issues, skin conditions, and thyroid disorders. In modern times, it remains a popular ingredient in health supplements, salads, and culinary dishes, particularly in coastal regions where it is harvested sustainably.

Ecologically, *Ulva lactuca* plays a significant role in marine ecosystems. It provides habitat and food for various marine organisms, including mollusks, crustaceans, and fish. However, its rapid growth can sometimes lead to harmful algal blooms, known as "green tides," which may disrupt local ecosystems and affect water quality. Efforts to manage these blooms often involve controlled harvesting or environmental interventions.

Beyond its biological importance, *Ulva lactuca* has cultural significance in Ireland and other coastal communities. It has been featured in folklore, used in traditional remedies, and incorporated into local cuisine, reflecting its long-standing relationship with human societies. As research continues, its potential applications in agriculture, pharmaceuticals, and environmental restoration remain areas of interest.