Roccella phycopsis is a species of lichen from the family Roccellaceae. This lichen is known for its utility in producing natural dyes. In the region of Comunidad Valenciana, it is often referred to by its local name, "Orseille." This designation highlights its historical significance in dye-making, particularly for producing shades of purple and blue.

Characteristics:

• Appearance: Roccella phycopsis has a fruticose (shrub-like) form with branching structures that can be described as strap-like. The lichen tends to have a greyish to black hue, especially as it matures.
• Habitat: This species is typically found in coastal areas, thriving in regions with high humidity and minimal pollution. It often colonizes rocks and sometimes man-made structures exposed to the sea.
• Dye Production: The lichen is historically significant for producing dyes known as orchil or cudbear, utilized in textile industries before synthetic dyes became prevalent.

Ecological Importance:

Roccella phycopsis, like other lichens, plays a vital role in the ecosystem. It contributes to soil formation by breaking down rocks, provides a habitat for various microorganisms, and serves as an indicator of air quality due to its sensitivity to pollution.