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Teloschistaceae
Blastenia crenularia (Caloplaca crenularia) Growth type crustose Chemical results: Apothecia K+ crimson / purple Found on coastal and inland siliceous rocks, well-lit or in shade. Grey cracked or areolate thallus with crowded rusty orange-red roughened apothecia, their colour remaining unchanged when wet. Margins shiny. The asci are 8-spored, ascospores 12-14 x 6-8 µm. Similar: C. ceraceae discs greenish when wet, matt margins |
Caloplaca crenularia
Portland, Dorset