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Megasporaceae
Circinaria contorta (Aspicilia contorta) Growth type crustose Chemistry: Thallus negative, epithecium olive-green, K+ orange-yellow. Very tolerant of nutrient enrichment, common and widespread on concrete, mortar and hard calcareous rocks. Greenish-grey thallus with separate, convex areoles that later merge and become paler. Prothallus indistinct. Apothecia are immersed black discs, often covered with bluish-white pruina and usually single in centre of each areole. Asci 4-8 spored, spores 22-26 × 15-19 µm. Two sub-species are recognised; subsp. contorta and subsp. hoffmanniana; photographs below |
Aspicilia contorta