Megasporaceae Circinaria hoffmanniana (Aspicilia contorta subsp hoffmaniana) Growth type crustose Chemical results negative A mainly urban pioneer species on cement, concrete, roof tiles and mortared walls. Tolerant of nutrient enrichment. Thallus thinner and slightly darker-grey than Circinaria contorta, areoles at margins flat and pressed together. The apothecia are prominent, 1(-3) on each areole. Asci (2-)4(-6) spored, spores simple, globose or subglobose, 17-28(-35) x (14-)17-26(-30) µm. Micrographs below. Similar: Circinaria contorta (Aspicilia contorta subsp. contorta)

Micrographs



Circinaria hoffmanniana, Aspicilia contorta subsp hoffmaniana
Photographs: Dorset, Dorset. 2017