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Images of British Lichens

Caloplaca arnoldii (Wedd.) Zahlbr. ex Ginzb.
subsp. obliterata (Pers.) Gaya

A tiny, yellow to deep orange Caloplaca with shortly lobate margins, the lobes somewhat swollen and less firmly appressed to the substrate near the tips, not pruinose. Widespread on sunny rocks and walls, said especially to be on vertical faces, mostly coastal, recorded more in the north and west but undoubtedly much overlooked.

Refs: Gaya (2009), 39, 185 (photos); Wilk (2012), 20 (photo), 37-8; Smith et al. (2009), 254 (as species); Dobson (2011), 115; Whelan (2011), 57 (photo, as species); Lichen Atlas of the British Isles 6: 236 (2001) (as species).

Caloplaca arnoldii
Caloplaca arnoldii
Caloplaca arnoldii
On rocks above shore, Ardilistry Bay, Islay, May 2011 (BLS meeting, material lent by Ivan Pedley)

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© A.J. Silverside
Uploaded June 2011, last updated September 2013