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Images of British Lichens

Arthonia apotheciorum (A.Massal.) Almq.
(= Arthonia clemens auct.)

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 species of the Lecanora dispersa group, notably Lecanora albescens, taking over and blackening the apothecia. Ascospores 1-septate (compare A. varians). Widespread, probably frequent but sparsely recorded.

Refs: Smith et al. (2009), 158; Purvis et al. (1992), 79 (as A. clemens).

Arthonia apotheciorum
In apothecia of Lecanora albescens, on coastal limestone, Sand Bay, Somerset, February 2010 (BLS meeting, material lent by John Skinner)

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© A.J. Silverside
Uploaded March 2011, last modified February 2013