Verrucariaceae Placidium squamulosum (Catapyrenium squamulosum) Growth type squamulose Chemical results negative Found on calcareous soils, sand and humus and sometimes associated with cyanobacterial crusts. Thick pale to dark brown, irregularly shaped squamules (2-7 mm diameter) attached to the substrate by hyaline to dark brown rhizoidal hyphae. Perithecia completely immersed with only the dark ostioles visible. The asci are 8-spored, spores simple, 12-16 x 5.5-7.5 µm. Micrograph below. Similar: Romjularia lurida

Microscope photograph

Placidium squamulosum
Ulwell Gap, Dorset. January 2016