Dark perithecia lichen

Dark perithecia lichen

Observation - Dark perithecia lichen - UK and Ireland. Description: Areolate, crustose thalli with patches in an individual thallus varying from dark brown to almost light grey. Dark immersed perithecia in middle of raised areas of thallus. Many thalli on a gently sloping siliceous rock bed, usually covered with freshwate

Areolate, crustose thalli with patches in an individual thallus varying from dark brown to almost light grey. Dark immersed perithecia in middle of raised areas of thallus. Many thalli on a gently sloping siliceous rock bed, usually covered with freshwater seeping down, exposed in the grass cliff. (These dark thalli and thalli of possible Ionaspis lacustris growing nearby indicated in picture ii.) Possibly Staurothele fissa.