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This crustose epiphyte with a thin, grey to greenish thallus studded with hard, black, frosted discs (1-2mm diam.) on the bark of old, senescent oaks, is a characteristic species of very old trees in drier areas. It may occasionally spread to acid rock. In Ireland it has its headquarters in the south-east.
Original text submitted by Simon Davey
|Simms, M. J., (2016). Cresponea premnea (Ach.) Egea & Torrente. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=19194 Accessed on 2017-02-21.