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On the north-facing surfaces of old limestone churches and ancient castle walls in warm, sheltered spots around Ireland, look for this species growing like a white-grey crust in small coalescing patches up to several centimetres wide. The grey crust is covered in a uniform dusting of powdery soredia so that it has a minutely speckled appearance. A fingernail dragged across the thallus should scratch orange. Discs are absent. Reactions: C+ rose-red, K-. Very thinly scattered in Ireland.
Original text submitted by Vince J. Giavarini
|Simms, M. J., (2016). Dirina massiliensis forma sorediata (Müll.Arg.) Tehler. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=432800 Accessed on 2017-04-27.