Caloplaca luteoalba
Description & Identification
This species is marked by abundant, bright-orange apothecia (generally 0.3 - 0.5 mm dia) crowded and often contiguous on an inconspicuous grey-white thallus.
C. luteoalba on decorticated sycamore. (Photo: Ray Woods).
Similar Species
It can resemble C. holocarpa in the field and a fruit body should be collected to determine spore size.
NBN Taxon Key
NBNSYS0000020545
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