Order: Verrucariales       Family: Verrucariaceae Species: Wahlenbergiella striatula (Verrucaria striatula) Growth type crustose. Photos: On maritime rock below HWM. Courtmacsherry, SW Ireland Very variable. Grass-green to dark dull green, thin, uncracked thallus, translucent when wet. Usually with small black spots and shiny ridges (ridges sparse or absent in shade). The prominent perithecia are often irregular in shape. Coastal on siliceous rocks between mid and high water mark. Most Irish records are from southern and western coasts. Chemical reactions negative.

Wahlenbergiella striatula (Verrucaria striatula). March 2009