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Caloplaca microthallina (Wedd.) Zahlbr.


Thallus of scattered, yellow lobules and squamules, lacking soredia; apothecia, when present, more conspicuous than the thallus. Common, except in the south-east, on sheltered coastal rockfaces in the Verrucaria maura zone. Distinguished from Candelariella species by testing crimson with KOH and by the spores with "Caloplaca-type" septa.

Refs: Smith et al. (2009), 267; Purvis et al. (1992), 155; Dobson (2005), 105 (photo); Dobson (2011), 114 (photo); Whelan (2011), 62 (photo); Lichen Atlas of the British Isles 6: 268 (2001).

 
Caloplaca microthallina
Caloplaca microthallina, close view
On coastal rockface, with Verrucaria maura, Kennedy's Pass, Ayrshire, May 2008


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Uploaded October 2008, last updated May 2012