Wahlenbergiella striatula forme verte.

   This morph, quite common, is characterized by its green thallus or in shades of green with very few wrinkles or ridges or with many more or less important wrinkles, the perithecia are a little smaller, less angular and less open at the top. Almost always with the black form Wahlenbergiella striatula forme noire from which it differs by a different exposure to light or by a different photobiont and in practice almost always with the crustose red alga Hildenbrandia rubra. There are many intermediaries linking this form to the type.

_ To be differentiated from Verrucaria halizoa which has a smooth thallus neither punctate nor striated and less angular and more regular perithecia.