Teloschistaceae Caloplaca obscurella Growth type crustose Chemical results: Negative. Thallus, soredia and apothecia K- Inconspicuous but common on dusty or nutrient-rich basic bark. Thin pale to dark grey-green thallus (brighter green when wet) with scattered or contiguous crater-like soralia. Soredia grey-green to bluish-grey. Apothecia are rare, small and Lecania-like, discs brownish, the margins soon excluded. Similar: Caloplaca ulcerosa

Caloplaca obscurella
Filcombe Farm, Dorset. November 2013