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Images of British Lichens
Arthonia varians (Davies) Nyl.
Lacks a thallus or its own photobiont (and arguably a "lichen" only as a member of a generally lichenised genus), occurs in the hymenium of Lecanora rupicola, taking over and blackening the apothecia, retarding their development. Ascospores (1-)2-3-septate (compare A. apotheciorum). Widespread and evidently common where the host occurs, but evidently under-recorded.
Refs: Smith et al. (2009), 170; Purvis et al. (1992), 87; Dobson (2005), 70 (photo); Dobson (2011), 76 (photo). |
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In apothecia of Lecanora rupicola on stonework of old bridge, Kindrogan, Perthshire, March 2008
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| In apothecia of Lecanora rupicola (apothecia scarcely pruinose) on coastal rocks, St Martin's Haven, Pembrokeshire, May 2009 |
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Uploaded November 2008, last updated November 2011
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