Images of British Lichens
Arthonia amylospora Almq.
Lacks a thallus or its own photobiont (and arguably a "lichen" only as a member of a generally lichenised genus), occurs in the thallus of Porpidia rugosa, forming clusters of ± rounded, black apothecia, to 0.35mm diameter (Coppins & Aptroot, in Smith et al., 2009), immersed in the host surface. Sparse, scattered records in western Britain.
Refs: Smith et al. (2009), 157; Purvis et al. (1992), 76.
|In thallus of Porpidia rugosa, seacliff at Bàgh a Ghallanaich, Isle of Muck, June 2012 BLS meeting|
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Uploaded February 2013, updated January 2016